Question

Question 20
Which of the following particles cannot be changed without changing the identity of the element?

a
neutrino particle
b
electron
c
neutron
d
proton
Question 21
Atoms of the same element with differing numbers of neutrons are called:

a
elements
b
compounds
c
ions
d
isotopes

Answer 1

**Question 20:**
The particle that cannot be changed without changing the identity of the element is:
**d - proton**

**Question 21:**
Atoms of the same element with differing numbers of neutrons are called:
**d - isotopes**