238552
There are six electrons, six protons and six neutrons in an atom of an element. What is the atomic number of the element?
1 6
2 12
3 18
4 24
Explanation:
Given, No. of electron $=6$ No. of proton $=6$ No. of neutron $=6$ We know that, Atomic No. $=$ No. of Proton Atomic No. $=6$ Hence, the atomic number of element $=6$.
NDA (II)-2016
Structure of Atom
238554
The sum of the total number of neutrons present in protium, deuterium and tritium is
1 5
2 3
3 4
4 6
Explanation:
No. of neutrons - Protium $\left({ }_1^1 \mathrm{H}\right)=0$ Deuterium $\left({ }_1^2 \mathrm{H}\right)=1$ Tritium $\left({ }_1^3 \mathrm{H}\right)=2$ The sum of the total number of neutrons is $\begin{aligned} & \Rightarrow 0+1+2 \\ & \Rightarrow 3 \end{aligned}$
TS-EAMCET (Engg.)
Structure of Atom
238556
Which of the following has magic number of protons and neutrons?
4 ${ }_{20} \mathrm{Ca}^{40} \longrightarrow \begin{aligned} & \text { neutron }=8 \\ & \longrightarrow \text { proton }=20\end{aligned}$ neutron $=20$ Thus, the calcium nucleic has the both proton and neutrons number is 20 .
Explanation:
Magic numbers are 2, 8, 20, 28, 50, 82 protons and $2,8,20,28,50,82,126$ neutrons in the nucleus. These numbers impart stability to the nucleus. (a.) ${ }_8 \mathrm{O}^{17} \longrightarrow$ proton $=8$ neutron $=9$ (b.) ${ }_{13} \mathrm{Al}^{27} \longrightarrow$ proton $=13$ neutron $=14$ (c.) ${ }_9 \mathrm{~F}^{17} \longrightarrow$ proton $=9$ (d.) ${ }_{20} \mathrm{Ca}^{40} \longrightarrow \begin{aligned} & \text { neutron }=8 \\ & \longrightarrow \text { proton }=20\end{aligned}$ neutron $=20$ Thus, the calcium nucleic has the both proton and neutrons number is 20 .
AP EAMCET (Medical) - 1998
Structure of Atom
238557
The species that has the same number of electrons as ${ }_{17}^{35} \mathrm{Cl}$ is
1 ${ }_{16}^{32} \mathrm{~S}$
2 ${ }_{16}^{34} \mathrm{~S}^{+}$
3 ${ }_{18}^{40} \mathrm{Ar}^{+}$
4 ${ }_{16}^{35} \mathrm{~S}^{2-}$
Explanation:
Given, ${ }_{17}^{35} \mathrm{Cl}$ No. of electron in ${ }_{17}^{35} \mathrm{Cl}=17$ No. of electron in ${ }_{16}^{32} \mathrm{~S}=16$ No. of electron in ${ }_{16}^{34} \mathrm{~S}^{+}=16-1=15$ No. of electron in ${ }_{18}^{40} \mathrm{Ar}^{+}=18-1=17$ No. of electron in ${ }_{16}^{35} \mathrm{~S}^{2-}=16+2=18$ Hence, ${ }_{18}^{40} \mathrm{Ar}^{+}$contain same no. of electron as ${ }_{17}^{35} \mathrm{Cl}$.
238552
There are six electrons, six protons and six neutrons in an atom of an element. What is the atomic number of the element?
1 6
2 12
3 18
4 24
Explanation:
Given, No. of electron $=6$ No. of proton $=6$ No. of neutron $=6$ We know that, Atomic No. $=$ No. of Proton Atomic No. $=6$ Hence, the atomic number of element $=6$.
NDA (II)-2016
Structure of Atom
238554
The sum of the total number of neutrons present in protium, deuterium and tritium is
1 5
2 3
3 4
4 6
Explanation:
No. of neutrons - Protium $\left({ }_1^1 \mathrm{H}\right)=0$ Deuterium $\left({ }_1^2 \mathrm{H}\right)=1$ Tritium $\left({ }_1^3 \mathrm{H}\right)=2$ The sum of the total number of neutrons is $\begin{aligned} & \Rightarrow 0+1+2 \\ & \Rightarrow 3 \end{aligned}$
TS-EAMCET (Engg.)
Structure of Atom
238556
Which of the following has magic number of protons and neutrons?
4 ${ }_{20} \mathrm{Ca}^{40} \longrightarrow \begin{aligned} & \text { neutron }=8 \\ & \longrightarrow \text { proton }=20\end{aligned}$ neutron $=20$ Thus, the calcium nucleic has the both proton and neutrons number is 20 .
Explanation:
Magic numbers are 2, 8, 20, 28, 50, 82 protons and $2,8,20,28,50,82,126$ neutrons in the nucleus. These numbers impart stability to the nucleus. (a.) ${ }_8 \mathrm{O}^{17} \longrightarrow$ proton $=8$ neutron $=9$ (b.) ${ }_{13} \mathrm{Al}^{27} \longrightarrow$ proton $=13$ neutron $=14$ (c.) ${ }_9 \mathrm{~F}^{17} \longrightarrow$ proton $=9$ (d.) ${ }_{20} \mathrm{Ca}^{40} \longrightarrow \begin{aligned} & \text { neutron }=8 \\ & \longrightarrow \text { proton }=20\end{aligned}$ neutron $=20$ Thus, the calcium nucleic has the both proton and neutrons number is 20 .
AP EAMCET (Medical) - 1998
Structure of Atom
238557
The species that has the same number of electrons as ${ }_{17}^{35} \mathrm{Cl}$ is
1 ${ }_{16}^{32} \mathrm{~S}$
2 ${ }_{16}^{34} \mathrm{~S}^{+}$
3 ${ }_{18}^{40} \mathrm{Ar}^{+}$
4 ${ }_{16}^{35} \mathrm{~S}^{2-}$
Explanation:
Given, ${ }_{17}^{35} \mathrm{Cl}$ No. of electron in ${ }_{17}^{35} \mathrm{Cl}=17$ No. of electron in ${ }_{16}^{32} \mathrm{~S}=16$ No. of electron in ${ }_{16}^{34} \mathrm{~S}^{+}=16-1=15$ No. of electron in ${ }_{18}^{40} \mathrm{Ar}^{+}=18-1=17$ No. of electron in ${ }_{16}^{35} \mathrm{~S}^{2-}=16+2=18$ Hence, ${ }_{18}^{40} \mathrm{Ar}^{+}$contain same no. of electron as ${ }_{17}^{35} \mathrm{Cl}$.
238552
There are six electrons, six protons and six neutrons in an atom of an element. What is the atomic number of the element?
1 6
2 12
3 18
4 24
Explanation:
Given, No. of electron $=6$ No. of proton $=6$ No. of neutron $=6$ We know that, Atomic No. $=$ No. of Proton Atomic No. $=6$ Hence, the atomic number of element $=6$.
NDA (II)-2016
Structure of Atom
238554
The sum of the total number of neutrons present in protium, deuterium and tritium is
1 5
2 3
3 4
4 6
Explanation:
No. of neutrons - Protium $\left({ }_1^1 \mathrm{H}\right)=0$ Deuterium $\left({ }_1^2 \mathrm{H}\right)=1$ Tritium $\left({ }_1^3 \mathrm{H}\right)=2$ The sum of the total number of neutrons is $\begin{aligned} & \Rightarrow 0+1+2 \\ & \Rightarrow 3 \end{aligned}$
TS-EAMCET (Engg.)
Structure of Atom
238556
Which of the following has magic number of protons and neutrons?
4 ${ }_{20} \mathrm{Ca}^{40} \longrightarrow \begin{aligned} & \text { neutron }=8 \\ & \longrightarrow \text { proton }=20\end{aligned}$ neutron $=20$ Thus, the calcium nucleic has the both proton and neutrons number is 20 .
Explanation:
Magic numbers are 2, 8, 20, 28, 50, 82 protons and $2,8,20,28,50,82,126$ neutrons in the nucleus. These numbers impart stability to the nucleus. (a.) ${ }_8 \mathrm{O}^{17} \longrightarrow$ proton $=8$ neutron $=9$ (b.) ${ }_{13} \mathrm{Al}^{27} \longrightarrow$ proton $=13$ neutron $=14$ (c.) ${ }_9 \mathrm{~F}^{17} \longrightarrow$ proton $=9$ (d.) ${ }_{20} \mathrm{Ca}^{40} \longrightarrow \begin{aligned} & \text { neutron }=8 \\ & \longrightarrow \text { proton }=20\end{aligned}$ neutron $=20$ Thus, the calcium nucleic has the both proton and neutrons number is 20 .
AP EAMCET (Medical) - 1998
Structure of Atom
238557
The species that has the same number of electrons as ${ }_{17}^{35} \mathrm{Cl}$ is
1 ${ }_{16}^{32} \mathrm{~S}$
2 ${ }_{16}^{34} \mathrm{~S}^{+}$
3 ${ }_{18}^{40} \mathrm{Ar}^{+}$
4 ${ }_{16}^{35} \mathrm{~S}^{2-}$
Explanation:
Given, ${ }_{17}^{35} \mathrm{Cl}$ No. of electron in ${ }_{17}^{35} \mathrm{Cl}=17$ No. of electron in ${ }_{16}^{32} \mathrm{~S}=16$ No. of electron in ${ }_{16}^{34} \mathrm{~S}^{+}=16-1=15$ No. of electron in ${ }_{18}^{40} \mathrm{Ar}^{+}=18-1=17$ No. of electron in ${ }_{16}^{35} \mathrm{~S}^{2-}=16+2=18$ Hence, ${ }_{18}^{40} \mathrm{Ar}^{+}$contain same no. of electron as ${ }_{17}^{35} \mathrm{Cl}$.
238552
There are six electrons, six protons and six neutrons in an atom of an element. What is the atomic number of the element?
1 6
2 12
3 18
4 24
Explanation:
Given, No. of electron $=6$ No. of proton $=6$ No. of neutron $=6$ We know that, Atomic No. $=$ No. of Proton Atomic No. $=6$ Hence, the atomic number of element $=6$.
NDA (II)-2016
Structure of Atom
238554
The sum of the total number of neutrons present in protium, deuterium and tritium is
1 5
2 3
3 4
4 6
Explanation:
No. of neutrons - Protium $\left({ }_1^1 \mathrm{H}\right)=0$ Deuterium $\left({ }_1^2 \mathrm{H}\right)=1$ Tritium $\left({ }_1^3 \mathrm{H}\right)=2$ The sum of the total number of neutrons is $\begin{aligned} & \Rightarrow 0+1+2 \\ & \Rightarrow 3 \end{aligned}$
TS-EAMCET (Engg.)
Structure of Atom
238556
Which of the following has magic number of protons and neutrons?
4 ${ }_{20} \mathrm{Ca}^{40} \longrightarrow \begin{aligned} & \text { neutron }=8 \\ & \longrightarrow \text { proton }=20\end{aligned}$ neutron $=20$ Thus, the calcium nucleic has the both proton and neutrons number is 20 .
Explanation:
Magic numbers are 2, 8, 20, 28, 50, 82 protons and $2,8,20,28,50,82,126$ neutrons in the nucleus. These numbers impart stability to the nucleus. (a.) ${ }_8 \mathrm{O}^{17} \longrightarrow$ proton $=8$ neutron $=9$ (b.) ${ }_{13} \mathrm{Al}^{27} \longrightarrow$ proton $=13$ neutron $=14$ (c.) ${ }_9 \mathrm{~F}^{17} \longrightarrow$ proton $=9$ (d.) ${ }_{20} \mathrm{Ca}^{40} \longrightarrow \begin{aligned} & \text { neutron }=8 \\ & \longrightarrow \text { proton }=20\end{aligned}$ neutron $=20$ Thus, the calcium nucleic has the both proton and neutrons number is 20 .
AP EAMCET (Medical) - 1998
Structure of Atom
238557
The species that has the same number of electrons as ${ }_{17}^{35} \mathrm{Cl}$ is
1 ${ }_{16}^{32} \mathrm{~S}$
2 ${ }_{16}^{34} \mathrm{~S}^{+}$
3 ${ }_{18}^{40} \mathrm{Ar}^{+}$
4 ${ }_{16}^{35} \mathrm{~S}^{2-}$
Explanation:
Given, ${ }_{17}^{35} \mathrm{Cl}$ No. of electron in ${ }_{17}^{35} \mathrm{Cl}=17$ No. of electron in ${ }_{16}^{32} \mathrm{~S}=16$ No. of electron in ${ }_{16}^{34} \mathrm{~S}^{+}=16-1=15$ No. of electron in ${ }_{18}^{40} \mathrm{Ar}^{+}=18-1=17$ No. of electron in ${ }_{16}^{35} \mathrm{~S}^{2-}=16+2=18$ Hence, ${ }_{18}^{40} \mathrm{Ar}^{+}$contain same no. of electron as ${ }_{17}^{35} \mathrm{Cl}$.
