Unit 6, Radiation,10

Question 1

Isotopes of the same element are different because…

Answer 1

Isotopes of the same element are different because…
they have different numbers of neutrons in the nucleus.

Question 2

Isotopes are

Answer 2

Isotopes are elements with the same number
of protons and electrons but a different mass
number because they have a different number
of neutrons.

Question 3

Charge and relative mass of electron, proton and neutron

Answer 3

Sub atomic particle| charge|r. mass
Electron | -1 | 1/1836
Proton | +1 | 1
Neutron | 0 | 1

Question 4

Relative atomic mass

Answer 4

Relative atomic mass = the
number of protons + the
number of neutrons. (the
higher number)

Question 5

Atomic number

Answer 5

Atomic number= the number
of protons in an atom (the
low number).

Question 6

The radioactivity of a source can also be measured using a…

Answer 6

The radioactivity of a source can also be measured using a Geiger-Müller (GM) tube.

Question 7

Alpha particle

Answer 7

4
a
2

Question 7

Beta particle

Answer 7

0
B
-1

Question 8

Positron particle

Answer 8

0
e
+1

Question 9

Half life

Answer 9

-The time it takes the number of radioactive nuclei
in a sample to decrease by half.

-The time it takes the activity from a radioisotope
to decrease by half.

Question 10

Smoke alarms contain a

Answer 10

Smoke alarms contain a weak source of alpha radiation.