Atomic Structure KO 1

Question 1

Define atom

Answer 1

The smallest part of an element that can exist

Question 2

All substances are made of…?

Answer 2

atoms

Question 3

The radius of an atom is?

Answer 3

0.1 nm (1 x 10to the power of 10 m)

Question 4

The overall charge on an element is…

Answer 4

zero/neutral

Question 5

Define element

Answer 5

Contains only one type of atom

Question 6

Substances found in the periodic table are…?

Answer 6

elements

Question 7

Approximately how many elements are there?

Answer 7

100

Question 8

Define isotope?

Answer 8

An atom of the same element with different numbers of neutrons but the same number of protons

Question 9

Define radioactive decay

Answer 9

An unstable nucleus changes to become more stable and gives out radiation

Question 10

We cannot predict when a given atom will decay, this means that radioactive decay is ….?

Answer 10

random

Question 11

Define activity

Answer 11

Rate at which decay occurs?

Question 12

What are the units of activity?

Answer 12

Becquerels (Bq)

Question 13

Define count rate

Answer 13

Number of decays recorded each second by a Geiger-Muller tube