Nuclei

Question 1

Nucleons

Answer 1

Protons & neutrons inside nucleus

Question 2

Atomic number(Z)

Answer 2

No of protons in nucleus

Question 3

Mass number(A)

Answer 3

Protons + neutrons

Question 4

Nuclear mass

Answer 4

Total mass of proton + neutrons

Question 5

Isotopes eg

Answer 5

1h1,1H2,1H3, 3Li6,3Li7,6C12,6C14

Question 6

Isobars eg

Answer 6

1H3,2He3, 17Cl37,16S37

Question 7

Isotones?

Answer 7

Same no of neutrons

Question 8

Isotones eg

Answer 8

17Cl37, 19K39

Question 9

Mirror nuclei

Answer 9

Atoms having same mass no but protons & neutrons are exchanged

Question 10

Mirror nuclei eg

Answer 10

3Li7,4Be7

Question 11

Atomic mass unit

Answer 11

1/12th of actually mass of C-12 atom

Question 12

1amu =

Answer 12

1.67/10²⁷kg

Question 13

Energy equivalent of 1u

Answer 13

931MeV

Question 14

Nuclear radius

Answer 14

R = R(o)A⅓

Question 15

R(o) is

Answer 15

Nuclear unit radius

Question 16

R(o) =

Answer 16

1.2/10¹⁵ m

Question 17

Nuclear density is independent of

Answer 17

Mass number

Question 18

Neutrons were discovered by

Answer 18

James Chadvik

Question 19

Properties of neutron

Answer 19

Elementary particle in nuclei except in H
Neutral
Rest mass is slightly more than proton
Stable inside nucleus
Don’t interact with e’s
Low ionizing power
Induce radioactivity
Needed to start nuclear fission rns