Question

Q.9 No. of electrons present in:
a) Calcium
b) Magnesium

Q.10 No. of electrons and protons present in:
a) Ne
b) Al³f
c) 0²-
d) N³-​

Answer 1

Answer:

Ne=10e- and no. of protons = 10

Al³+= 10e- and 13 protons (I had taken f as +)

O²-= 10e- and 8 protons

N³-=10e- and 7 protons

Answer 2

Answer:

a) 20

Calcium is the 20th element, with 20 protons . Since a stable atom has a net charge of 0, we must have 20 electrons.

b) 12

The atomic number of magnesium is 12 which means that in a non-ionized state the number of electrons in magnesium is 12.

Q.10

O²- = 10e- (8 protons)

N³- = 10e- (7 protons)