Question

please help me to solve these questions please!​

Answer 1

Answer:

a - q

b - p

c - s

d - r

or, (A) is the correct answer

Answer 2

Answer:

option 1 is correct

Explanation:

ISOTOPES --- same no. of protons

in q all oxygen atoms have same no. of protons(=8)

ISOBARS -- same mass no.

in p Ar and Ca has same mass no.(=40)

ISOTONES --- same no. of neutrons

in s C,N and O has same no. of neutrons(=8)

ISOELECTONIC --- elements or ions with same no. of electrons in outer shell

in r O2-, Na+ and Mg2+ has same valence electrons