THE NUCLEUS + HALF LIFE

Question 1

relative charge of electron

Answer 1

-1

Question 2

relative charge of neutron

Answer 2

0

Question 3

relative charge of proton

Answer 3

+1

Question 4

relative mass of proton

Answer 4

1

Question 5

relative mass of electron

Answer 5

negligible

Question 6

relative mass of neutron

Answer 6

1

Question 7

what is an ion?

Answer 7

a charged atom due to loss or gain of an electron

Question 8

what is an isotope?

Answer 8

an atom of the same element that has the same number of electrons and protons but a different number of neutrons

Question 9

definition of decay

Answer 9

when a nucleus changes composition to become stable

Question 10

what is the mass number?

Answer 10

the number of protons and neutrons in an atom

Question 11

what is the atomic number?

Answer 11

number of protons in the atom

Question 12

decay is a ……………. process

Answer 12

RANDOM

Question 13

what is the half life?

Answer 13

the average time for half the unstable nuclei to decay

Question 14

what is the activity

Answer 14

the number of decays per second

Question 15

what is the unit of activity?

Answer 15

Bq - becquerels