Give the number of electrons in the species H₂⁺, H₂ and O₂⁺

Question 27 of 62beginner🔧 ApplyVery Short1 mark

Correct Answer

(H₂) 2 electrons

(H₂⁺) 1 electron

(O₂⁺) 15 electrons

Exercise: EXERCISES | Q: 2.27 | (Page 41)

For More Understanding

Explanation

To find the number of electrons in a species, we calculate the total number of electrons from all the atoms present and then adjust for the charge. A positive charge means electrons are lost, and a negative charge means electrons are gained.

Solution Steps

Step 1: For $H_2^+$ , hydrogen (H) has 1 electron. Two H atoms have $1 + 1 = 2$ electrons. The +1 charge means 1 electron is removed. Total electrons = $2 - 1 = 1$ .
Step 2: For $H_2$ , two neutral hydrogen atoms have $1 + 1 = 2$ electrons. There is no charge, so total electrons = 2.
Step 3: For $O_2^+$ , oxygen (O) has 8 electrons. Two O atoms have $8 + 8 = 16$ electrons. The +1 charge means 1 electron is removed. Total electrons = $16 - 1 = 15$ .

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