Question

The atomic numbers of six elements A,B,C,D ,E and F are given below :
(i) Which atom will form an ion having 1 unit positive charge?
(ii) Which atom will form an ion having 2 units negative charge?
(iii) Which atom will not form an ion?

Answer 1

Answer:

Correct option is A)

Let the X and is represented as:

Z

56

X

3+

Let the atomic number (Z)/ number of potons (p) be

′

x

′

Given: 3 units of positive charge

thus, number of electrons =x−3

Number of neutrons,n=30.4% more neutrons than electrons

n=(x−3)+

100

30.4

×(x−3)

n=(

100

30.4

+1)×(x−3)

n=1.304(x−3)

Mass number of X=56

Mass number of an atom=number of protons + number of neutrons

∴56=x+1.304(x−3)

or 56=2.304x−3.912

59.912=2.304x

x=26

Thus, number of protons (p) =x=26, element is Iron (Fe)

number of electrons (e) =x−3=26−3=23.

Therefore, symbol of the

26

56

Fe

3+

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Explanation:

Answer 2

Hence, The atoms having +1 unit positive charge, -2 unit negative charge, and the atom which will not form an ion are B, F and C respectively.

Given:-

Elements = A, B, C, D, E, F

Atomic Numbers = 9, 19, 18, 13, 12, 16

To Find:-

The atoms having +1 unit positive charge, -2 unit negative charge, and the atom which will not form an ion.

Solution:-

We can easily find out the atoms having +1 unit positive charge, -2 unit negative charge, and the atom which will not form an ion by using these simple steps.

As

Elements = A, B, C, D, E, F

Atomic Numbers = 9, 19, 18, 13, 12, 16

Now, before going to find out the atoms having +1 unit positive charge, -2 unit negative charge, and the atom which will not form an ion, first, we need to find out the electronic configuration of all the elements.

Now,

A = 9 = 1s² 2s² 2p⁵

B = 19 = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹

C = 18 = 1s² 2s² 2p⁶ 3s² 3p⁶

D = 13 = 1s² 2s² 2p⁶ 3s² 3p¹

E = 12 = 1s² 2s² 2p⁶ 3s²

F = 16 = 1s² 2s² 2p⁶ 3s² 3p⁴

Here,

A will gain 1 electron to complete it's octet.

B will loose 1 electron to complete it's octet.

C will not gain or loose any electron because it has inert gas configuration.

D will loose 3 electron to complete it's octet.

E will loose 2 electron to complete it's octet.

F will gain 2 electrons to complete it's octet.

Hence, The atoms having +1 unit positive charge, -2 unit negative charge, and the atom which will not form an ion are B, F and C respectively.

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