Question

The number of protons in one atom of an element X is 8. What will be the number of electrons in its ion i)X^2- ii)X^2+

Answer 1

Required Answer:-

In a neutral atom, the no. of protons is equal to the no. of electrons. That means, In the neutral atom of the element, No. of electrons will be 8.

Given ions:

1) X²-

Negative 2- means the atom has gained 2 electrons. Hence, the total no. of electrons = 8 + 2 = 10

2) X²+

Positive 2+ means the atom has lost 2 electrons. Hence, the total no. of electrons will be 8 - 2 = 6

Why atom gain/loss electrons?

• Not every atom is stable.
• Stable means the outermost shell should have octet/duplet configuration.
• To become stable, it gain/loss electrons on the basis of energy requirements.
• In this process, it forms bonds and then compounds (combined forms)$.$

Answer 2

${\rm{\underline{\underline{Question:-}}}}$

→ The number of protons in one atom of an element X is 8. What will be the number of electrons in its ion ?

   i) X^2-   ii)X^2+

${\rm{\underline{\underline{Answer:-}}}}$

→ No. of protons = No. of electrons

(in an atom)

i) In $X^{2-\;}$

= 8 + 2 ( gained electrons ) = 8 + 2 = 10 electrons

ii) In $X^{2+\,}$

= 8 - 2 ( lost electrons ) = 8 - 2 = 6 electrons

${\rm{\underline{\underline{Additional\;Info:-}}}}$

→ Sometimes atoms gain or lose electrons.

→ The atom then loses or gains a "negative" charge.

→ These atoms are then called ions.

→ Positive Ion - Occurs when an atom loses an electron (negative charge) it has more protons than electrons.

→ Negative Ion - Occurs when an atom gains an electron (negative charge) it will have more electrons than protons.

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All Done !! :D