Question

An element x has mass number 55 and number of neutrons is 30 identify the group number and the period number

Answer 1

Answer:

group 1 and period 6.. in the table

Answer 2

• Given :

♦ mass number = 55

♦ no. of neutrons = 30

• To Find :

♦ Group number and period number of element...

• As we know :

♦ Mass number = protons + neutrons

So, no. of protons = 55 - 30 = 25

♦ no. of protons is always equal to no. of electrons...

So, no. of electrons = 25

• Electronic configuration :

♦ [Ar] 3d^5 4s^2

• Answer :

♦ Group number = 5 + 2 = 7

♦ Period number = 4