Question

(1.) Which of the following is poly atomic ion
(a) Na+
(b) cu+
(c) OH-
(d) A13+

(2.) Atomic mass of Potassium is
(a) 39
(b) 19
(c) 40
(d) 38

(3.)Number of protons of an atom is called
(a) mass number
(b) atomic number
(c) isotope
(d) isobar

(4.) Is the diatomic molecule of compound
(a) O3
(b) C12
(c) Nacl
(d) H2O




​

Answer 1

Answer:

1.(c)

2.(a)

3.(b)

4.(c)

Answer 2

Answer:

1.OH-

2.39

3.atomic mass

4.H2O