Question

give the formula of one species positively charged and one negatively charged that will be isoelectronic with helium​

Answer 1

Explanation:

1 is hydrogen anion (h-)

2 is lithium cation (li+)

Answer 2

Answer:

The formula of one species positively charged and negatively charged which is isoelectronic with Helium are respectively Li⁺ (Lithium ion) and H⁻ (hydride ion)

Explanation:

The term Isoelectronic means the ions have the identical number of electrons in same ground state configurations.

Here, Helium(He) has a ground state configuration of $1s^{2}$ and has 2 electrons.

On the other hand, Li has a configuration of  $1s^{2} 2s^{1}$

So if Lithium looses one electron of $2s$ orbital it becomes Lithium ion (Li⁺) which also has 2 electrons in $1s$ orbital which makes Li⁺ isoelectronic with Helium.

As we know H has configuration of $1s^{1}$ and has 1 electron, when H gain one electron it becomes Hydride ion (H⁻) which again have identical numbers of electrons in $1s$ orbital.

Hence, Li⁺ is the positively charged and H⁻ is negatively charged ions which are isoelectronic with Helium.

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