Atomic Structure

Question 1

Describe how the Dalton model of an atom has changed over time

Answer 1

They have discovered the existence of protons, neutrons and electrons

Question 2

Give the charge of a proton

Answer 2

+ 1

Question 3

Give the charge of the neutron

Answer 3

0 (neutral)

Question 4

Give the charge of an electron

Answer 4

-1

Question 5

Give the mass of a proton

Answer 5

One

Question 6

Give the mass of a neutron

Answer 6

One

Question 7

Give the mass of an electron

Answer 7

1/2000

Question 8

Why do atoms contain equal numbers of protons and electrons

Answer 8

They are neutral as the charges cancel

Question 9

Compare the size of an atom and the nucleus

Answer 9

The nucleus is very very small compared to the atom

Question 10

Where in the atom would you find most of the mass?

Answer 10

Nucleus

Question 11

What does the atomic number tell you?

Answer 11

The number of protons

Question 12

What are isotopes?

Answer 12

Atoms of the same element with a different numbers of neutrons

Question 13

Look at a periodic table. What is in a lithium atom?

Answer 13

3protons, 3 electrons, 4 neutrons

Question 14

Why is the mass of a chlorine atom not a whole number

Answer 14

Atomic mass is the AVERAGE mass of an atom, chlorine has isotopes

Question 15

75% of chlorine has a mass of 35, 25% has a mass of 75. Calculate the relative atomic mass.

Answer 15

((75x35) +(25x37))/100 = 35.5