Atom Structure

Question 1

Where is the nucleus of an atom?

Answer 1

In the middle

Question 2

What is in the nucleus of an atom?

Answer 2

Protons and neutrons

Question 3

where are electrons in atoms?

Answer 3

Surrounding the nucleus in shells

Question 4

What is the relative mass of a proton?

Answer 4

1

Question 5

What is the relative mass of a neutron?

Answer 5

1

Question 6

What is the relative of an electron?

Answer 6

~1/1840

Question 7

What is the charge of a proton?

Answer 7

+1, positive

Question 8

What is the charge of a neutron?

Answer 8

0, neutral

Question 9

What is the charge of an electron?

Answer 9

-1, negative

Question 10

Describe the plum pudding model of the atom

Answer 10

a large, positive charge with negative electrons arranged randomly as ‘plums’

Question 11

What are the differences between Dalton’s model of the atom and the current model?

Answer 11

Dalton’s model did not contain protons, neutrons and electrons. Dalton’s model did not have a nucleus. Dalton’s model did not have any charges.

Question 12

What is the overall charge of an atom?

Answer 12

0

Question 13

Why is the overall charge of an atom 0?

Answer 13

The numbers of protons and electrons are equal.

Question 14

Where is most of the mass of an atom?

Answer 14

The nucleus

Question 15

What is an isotope?

Answer 15

Different atoms of the same element which have the same number of protons but different numbers of neutrons.

Question 16

What does an atom’s atomic number show you about the atom?

Answer 16

the number of protons

Question 17

What does an atom’s mass number show you about the atom?

Answer 17

The number of protons + the number of neutrons

Question 18

How do you work out the number of protons in an atom?

Answer 18

Look at the atomic number

Question 19

How do you work out the number of electrons in an atom?

Answer 19

Look at the atomic number

Question 20

How do you work out the number of neutrons in an atom?

Answer 20

Mass number - atomic number

Question 21

how many electrons can fit in the first shell of an atom?

Answer 21

2

Question 22

How many electrons can fit in the second shell of an atom?

Answer 22

8

Question 23

How many electrons can fit in the third shell of an atom?

Answer 23

8

Question 24

How many protons neutrons and electrons are in sodium? (atomic number = 11, mass number =23)

Answer 24

protons: 11,
electrons: 11,
neutrons: 23-11 =12

Question 25

what is the electron configuration of sodium? (atomic number = 11)

Answer 25

2,8,1