Question

Note: Attempt all questions.
Q1. Write down the atomic numbers and atomic masses of the following elements.
a) Ce
b) Cd
c) Pb d) Ar e Fr​

Answer 1

(a) Ce - 58 (Atomic No. ). 140( at mass)

(b) Cd - 48. (A No. ). 112 (at mass)

(c) Pb- 82 ( at no. ). 207 ( at mass)

(d) Ar- 18 ( at no. ). 40 ( at mass).

(e) Fr - 87 ( at no. ). 233 ( at mass)

Answer 2

Answer:

a) ce

atomic number is : 58

atomic masses is : 140.12

b) cd

atomic number is : 48

atomic masses is : 112.41

c) pb

atomic number is : 82

atomic masses is : 207.2

d) Ar e Fr ( no idea sorry )

hope it helped u