NEET Test Series from KOTA - 10 Papers In MS WORD
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Structure of Atom
9697
Which one of the following is not isoelectronic with \({O^{2 - }}\)
1 \({N^{3 - }}\)
2 \({F^ - }\)
3 \(T{l^ + }\)
4 \(N{a^ + }\)
Explanation:
Isoelectronic means having the same number of electrons. Oxygen\((II)\) anion has \(10\) electrons. \(Na ^{+}\)has \(10\) electrons. \(F ^{-}\)has \(10\) electrons. \(Ti\) has atomic number \(22\) which is not isoelectronic with oxygen anion.
Structure of Atom
9698
The number of electrons in \({[_{19}^{40}K]^{ - 1}}\) is
1 \(19\)
2 \(40\)
3 \(18\)
4 \(20\)
Explanation:
\(\left[{}_{19} K ^{40}\right]^{-1}\) \((-19)+(-1)=20\) electrons
Structure of Atom
9699
The number of electrons and neutrons of an element is \(18\) and \(20 \) respectively. Its mass number is
1 \(38\)
2 \(37\)
3 \(2\)
4 \(17\)
Explanation:
(d) No. of proton and no. of electron = 18\([Ar_{18}^{36}]\) and No. of neutron \(= 20\) Mass number \(= P + N =\) \(18 + 20 = 38.\)
Structure of Atom
9700
Number of protons, neutrons and electrons in the element \(_{89}^{231}Y\) is
1 \(89, 231, 89\)
2 \(89, 89, 242\)
3 \(89, 142, 89\)
4 \(89, 71, 89\)
Explanation:
(c) In \(Xe_{89}^{231}\) number of protons and electrons is \(89\) and No. of neutrons \( = A -Z = 231 -89 = 142.\)
9697
Which one of the following is not isoelectronic with \({O^{2 - }}\)
1 \({N^{3 - }}\)
2 \({F^ - }\)
3 \(T{l^ + }\)
4 \(N{a^ + }\)
Explanation:
Isoelectronic means having the same number of electrons. Oxygen\((II)\) anion has \(10\) electrons. \(Na ^{+}\)has \(10\) electrons. \(F ^{-}\)has \(10\) electrons. \(Ti\) has atomic number \(22\) which is not isoelectronic with oxygen anion.
Structure of Atom
9698
The number of electrons in \({[_{19}^{40}K]^{ - 1}}\) is
1 \(19\)
2 \(40\)
3 \(18\)
4 \(20\)
Explanation:
\(\left[{}_{19} K ^{40}\right]^{-1}\) \((-19)+(-1)=20\) electrons
Structure of Atom
9699
The number of electrons and neutrons of an element is \(18\) and \(20 \) respectively. Its mass number is
1 \(38\)
2 \(37\)
3 \(2\)
4 \(17\)
Explanation:
(d) No. of proton and no. of electron = 18\([Ar_{18}^{36}]\) and No. of neutron \(= 20\) Mass number \(= P + N =\) \(18 + 20 = 38.\)
Structure of Atom
9700
Number of protons, neutrons and electrons in the element \(_{89}^{231}Y\) is
1 \(89, 231, 89\)
2 \(89, 89, 242\)
3 \(89, 142, 89\)
4 \(89, 71, 89\)
Explanation:
(c) In \(Xe_{89}^{231}\) number of protons and electrons is \(89\) and No. of neutrons \( = A -Z = 231 -89 = 142.\)
9697
Which one of the following is not isoelectronic with \({O^{2 - }}\)
1 \({N^{3 - }}\)
2 \({F^ - }\)
3 \(T{l^ + }\)
4 \(N{a^ + }\)
Explanation:
Isoelectronic means having the same number of electrons. Oxygen\((II)\) anion has \(10\) electrons. \(Na ^{+}\)has \(10\) electrons. \(F ^{-}\)has \(10\) electrons. \(Ti\) has atomic number \(22\) which is not isoelectronic with oxygen anion.
Structure of Atom
9698
The number of electrons in \({[_{19}^{40}K]^{ - 1}}\) is
1 \(19\)
2 \(40\)
3 \(18\)
4 \(20\)
Explanation:
\(\left[{}_{19} K ^{40}\right]^{-1}\) \((-19)+(-1)=20\) electrons
Structure of Atom
9699
The number of electrons and neutrons of an element is \(18\) and \(20 \) respectively. Its mass number is
1 \(38\)
2 \(37\)
3 \(2\)
4 \(17\)
Explanation:
(d) No. of proton and no. of electron = 18\([Ar_{18}^{36}]\) and No. of neutron \(= 20\) Mass number \(= P + N =\) \(18 + 20 = 38.\)
Structure of Atom
9700
Number of protons, neutrons and electrons in the element \(_{89}^{231}Y\) is
1 \(89, 231, 89\)
2 \(89, 89, 242\)
3 \(89, 142, 89\)
4 \(89, 71, 89\)
Explanation:
(c) In \(Xe_{89}^{231}\) number of protons and electrons is \(89\) and No. of neutrons \( = A -Z = 231 -89 = 142.\)
9697
Which one of the following is not isoelectronic with \({O^{2 - }}\)
1 \({N^{3 - }}\)
2 \({F^ - }\)
3 \(T{l^ + }\)
4 \(N{a^ + }\)
Explanation:
Isoelectronic means having the same number of electrons. Oxygen\((II)\) anion has \(10\) electrons. \(Na ^{+}\)has \(10\) electrons. \(F ^{-}\)has \(10\) electrons. \(Ti\) has atomic number \(22\) which is not isoelectronic with oxygen anion.
Structure of Atom
9698
The number of electrons in \({[_{19}^{40}K]^{ - 1}}\) is
1 \(19\)
2 \(40\)
3 \(18\)
4 \(20\)
Explanation:
\(\left[{}_{19} K ^{40}\right]^{-1}\) \((-19)+(-1)=20\) electrons
Structure of Atom
9699
The number of electrons and neutrons of an element is \(18\) and \(20 \) respectively. Its mass number is
1 \(38\)
2 \(37\)
3 \(2\)
4 \(17\)
Explanation:
(d) No. of proton and no. of electron = 18\([Ar_{18}^{36}]\) and No. of neutron \(= 20\) Mass number \(= P + N =\) \(18 + 20 = 38.\)
Structure of Atom
9700
Number of protons, neutrons and electrons in the element \(_{89}^{231}Y\) is
1 \(89, 231, 89\)
2 \(89, 89, 242\)
3 \(89, 142, 89\)
4 \(89, 71, 89\)
Explanation:
(c) In \(Xe_{89}^{231}\) number of protons and electrons is \(89\) and No. of neutrons \( = A -Z = 231 -89 = 142.\)
