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Answer 1

let n be no of neutrons and p be no of protons

Beryllium has 5 Neutrons

Atomic mass =No of protons + Neutrons

9=4+ n

n=5

boron has 6 Neutrons

Atomic mass= p+n

11=5+n

n=6

Hydrogen has no neutons

A.M= p+n

1+n=1

n=0

ARGON

40=18+n

n=22

calcium

40=20+n

n=20

Answer 2

Answer:

number of neutron in hydrogen are 0,1 ,2

neutron in berelium are 5

neutron in boron are 6

neutron in argon are 18,20,22

neutron in calcium are 20

Explanation:

in nature 3 isotopes of hydrogen present there atomic mass is 1, 2, 3 respectively

atomic number of hydrogen is 1

Number of Neutron = Atomic mass - atomic number