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Structure of Atom

9718 The atomic number of an element is $35.$ What is the total number of electrons present in all the $p -$ orbitals of the ground state atom of that element

1

6

2

11

3

17

4

23

Explanation:

(c) $X_{35} = 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{10} 4 s^{2} 4 p^{5}$
Total no. of $e^{-}$ is all $p -$ orbitals $= 6 + 6 + 5 = 17$ .

Structure of Atom

9719 The nucleus of an element contain $9$ protons. Its valency would be

1

1

2

3

3

2

4

5

Explanation:

(a) Since its nucleus contain $9$ proton so its. atomic number is $9$ and its electronic configuration is $2, 7.$ So it require one more electron to complete its octet. Hence its valency is $1.$

Structure of Atom

9720 The compound in which cation is isoelectronic with anion is

1

N a C l

2

C s F

3

N a I

4

K_{2} S

Explanation:

(d) $K_{2} S$ formed by $K^{+}$ and $S^{2 -}$ ion. We know that atomic number of K is $19$ and in $K^{+}$ ion its atomic number would be $18$ similarly atomic number of $S$ is $16$ and in form $S^{2 -}$ ion its atomic number would be $18$ so the $K^{+}$ and $S^{2 -}$ are isoelectronic with each other in $K_{2} S$ .

Structure of Atom

9721 Which among the following species have the same number of electrons in its outermost as well as penultimate shell

1

M g^{2 +}

2

O^{2 -}

3

F^{-}

4

C a^{2 +}

Explanation:

(d) $_{20} C a = 2, 8, 8, 2$
$C a^{2 +} = 2, 8, 8$
Hence, $C a^{2 +}$ has $8$ electrons each in outermost and penultimate shell.

Structure of Atom

9722 Six protons are found in the nucleus of

1 Boron

2 Lithium

3 Carbon

4 Helium

Explanation:

(c) Atomic no. of $C = 6$ so the number of protons in the nucleus $= 6$

Structure of Atom

9718 The atomic number of an element is $35.$ What is the total number of electrons present in all the $p -$ orbitals of the ground state atom of that element

1

6

2

11

3

17

4

23

Explanation:

(c) $X_{35} = 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{10} 4 s^{2} 4 p^{5}$
Total no. of $e^{-}$ is all $p -$ orbitals $= 6 + 6 + 5 = 17$ .

Structure of Atom

9719 The nucleus of an element contain $9$ protons. Its valency would be

1

1

2

3

3

2

4

5

Explanation:

(a) Since its nucleus contain $9$ proton so its. atomic number is $9$ and its electronic configuration is $2, 7.$ So it require one more electron to complete its octet. Hence its valency is $1.$

Structure of Atom

9720 The compound in which cation is isoelectronic with anion is

1

N a C l

2

C s F

3

N a I

4

K_{2} S

Explanation:

(d) $K_{2} S$ formed by $K^{+}$ and $S^{2 -}$ ion. We know that atomic number of K is $19$ and in $K^{+}$ ion its atomic number would be $18$ similarly atomic number of $S$ is $16$ and in form $S^{2 -}$ ion its atomic number would be $18$ so the $K^{+}$ and $S^{2 -}$ are isoelectronic with each other in $K_{2} S$ .

Structure of Atom

9721 Which among the following species have the same number of electrons in its outermost as well as penultimate shell

1

M g^{2 +}

2

O^{2 -}

3

F^{-}

4

C a^{2 +}

Explanation:

(d) $_{20} C a = 2, 8, 8, 2$
$C a^{2 +} = 2, 8, 8$
Hence, $C a^{2 +}$ has $8$ electrons each in outermost and penultimate shell.

Structure of Atom

9722 Six protons are found in the nucleus of

1 Boron

2 Lithium

3 Carbon

4 Helium

Explanation:

(c) Atomic no. of $C = 6$ so the number of protons in the nucleus $= 6$

Structure of Atom

9718 The atomic number of an element is $35.$ What is the total number of electrons present in all the $p -$ orbitals of the ground state atom of that element

1

6

2

11

3

17

4

23

Explanation:

(c) $X_{35} = 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{10} 4 s^{2} 4 p^{5}$
Total no. of $e^{-}$ is all $p -$ orbitals $= 6 + 6 + 5 = 17$ .

Structure of Atom

9719 The nucleus of an element contain $9$ protons. Its valency would be

1

1

2

3

3

2

4

5

Explanation:

(a) Since its nucleus contain $9$ proton so its. atomic number is $9$ and its electronic configuration is $2, 7.$ So it require one more electron to complete its octet. Hence its valency is $1.$

Structure of Atom

9720 The compound in which cation is isoelectronic with anion is

1

N a C l

2

C s F

3

N a I

4

K_{2} S

Explanation:

(d) $K_{2} S$ formed by $K^{+}$ and $S^{2 -}$ ion. We know that atomic number of K is $19$ and in $K^{+}$ ion its atomic number would be $18$ similarly atomic number of $S$ is $16$ and in form $S^{2 -}$ ion its atomic number would be $18$ so the $K^{+}$ and $S^{2 -}$ are isoelectronic with each other in $K_{2} S$ .

Structure of Atom

9721 Which among the following species have the same number of electrons in its outermost as well as penultimate shell

1

M g^{2 +}

2

O^{2 -}

3

F^{-}

4

C a^{2 +}

Explanation:

(d) $_{20} C a = 2, 8, 8, 2$
$C a^{2 +} = 2, 8, 8$
Hence, $C a^{2 +}$ has $8$ electrons each in outermost and penultimate shell.

Structure of Atom

9722 Six protons are found in the nucleus of

1 Boron

2 Lithium

3 Carbon

4 Helium

Explanation:

(c) Atomic no. of $C = 6$ so the number of protons in the nucleus $= 6$

Structure of Atom

9718 The atomic number of an element is $35.$ What is the total number of electrons present in all the $p -$ orbitals of the ground state atom of that element

1

6

2

11

3

17

4

23

Explanation:

(c) $X_{35} = 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{10} 4 s^{2} 4 p^{5}$
Total no. of $e^{-}$ is all $p -$ orbitals $= 6 + 6 + 5 = 17$ .

Structure of Atom

9719 The nucleus of an element contain $9$ protons. Its valency would be

1

1

2

3

3

2

4

5

Explanation:

(a) Since its nucleus contain $9$ proton so its. atomic number is $9$ and its electronic configuration is $2, 7.$ So it require one more electron to complete its octet. Hence its valency is $1.$

Structure of Atom

9720 The compound in which cation is isoelectronic with anion is

1

N a C l

2

C s F

3

N a I

4

K_{2} S

Explanation:

(d) $K_{2} S$ formed by $K^{+}$ and $S^{2 -}$ ion. We know that atomic number of K is $19$ and in $K^{+}$ ion its atomic number would be $18$ similarly atomic number of $S$ is $16$ and in form $S^{2 -}$ ion its atomic number would be $18$ so the $K^{+}$ and $S^{2 -}$ are isoelectronic with each other in $K_{2} S$ .

Structure of Atom

9721 Which among the following species have the same number of electrons in its outermost as well as penultimate shell

1

M g^{2 +}

2

O^{2 -}

3

F^{-}

4

C a^{2 +}

Explanation:

(d) $_{20} C a = 2, 8, 8, 2$
$C a^{2 +} = 2, 8, 8$
Hence, $C a^{2 +}$ has $8$ electrons each in outermost and penultimate shell.

Structure of Atom

9722 Six protons are found in the nucleus of

1 Boron

2 Lithium

3 Carbon

4 Helium

Explanation:

(c) Atomic no. of $C = 6$ so the number of protons in the nucleus $= 6$

Structure of Atom

9718 The atomic number of an element is $35.$ What is the total number of electrons present in all the $p -$ orbitals of the ground state atom of that element

1

6

2

11

3

17

4

23

Explanation:

(c) $X_{35} = 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{10} 4 s^{2} 4 p^{5}$
Total no. of $e^{-}$ is all $p -$ orbitals $= 6 + 6 + 5 = 17$ .

Structure of Atom

9719 The nucleus of an element contain $9$ protons. Its valency would be

1

1

2

3

3

2

4

5

Explanation:

(a) Since its nucleus contain $9$ proton so its. atomic number is $9$ and its electronic configuration is $2, 7.$ So it require one more electron to complete its octet. Hence its valency is $1.$

Structure of Atom

9720 The compound in which cation is isoelectronic with anion is

1

N a C l

2

C s F

3

N a I

4

K_{2} S

Explanation:

(d) $K_{2} S$ formed by $K^{+}$ and $S^{2 -}$ ion. We know that atomic number of K is $19$ and in $K^{+}$ ion its atomic number would be $18$ similarly atomic number of $S$ is $16$ and in form $S^{2 -}$ ion its atomic number would be $18$ so the $K^{+}$ and $S^{2 -}$ are isoelectronic with each other in $K_{2} S$ .

Structure of Atom

9721 Which among the following species have the same number of electrons in its outermost as well as penultimate shell

1

M g^{2 +}

2

O^{2 -}

3

F^{-}

4

C a^{2 +}

Explanation:

(d) $_{20} C a = 2, 8, 8, 2$
$C a^{2 +} = 2, 8, 8$
Hence, $C a^{2 +}$ has $8$ electrons each in outermost and penultimate shell.

Structure of Atom

9722 Six protons are found in the nucleus of

1 Boron

2 Lithium

3 Carbon

4 Helium

Explanation:

(c) Atomic no. of $C = 6$ so the number of protons in the nucleus $= 6$

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