Question

The number of electrons and neutrons in 18
8O atom are respectively :
(A) 8 and 18 (B) 8 and 10
(C) 10 and 8 (D) 10 and 18

Answer 1

Answer:

The number of electrons and neutrons in this atom is 8 and 10.

(B) is correct.

Explanation:

Given that,

The number of electrons and neutrons in ₈¹⁸O atom

Here, 18 is the mass number and 8 is the atomic number.

Mass number:

Mass number is the sum of the protons and neutrons.

Z=n+p

Where, n = neutron

p = proton

Atomic number:

Atomic number is the number of protons or electrons.

A=e, A = p

Where, e = electron

p = proton

So,

In this atom,

The number of electron e= 8

The number of neutrons n= Z-p

$n= 18-8=10$

Hence, The number of electrons and neutrons in this atom is 8 and 10.

Answer 2

The correct answer is

B) 8 and 10