The Atom

Question 1

Who said everything is made from atoms?

Answer 1

The Ancient Greeks

Question 2

In what year were electrons discovered?

Answer 2

1897

Question 3

What experiment was carried out to prove if the plum-pudding model was correct?

Answer 3

Alpha scattering experiment

Question 4

Atoms are mainly made up of what?

Answer 4

Empty space

Question 5

What charge must the centre of an atom have?

Answer 5

positive charge

Question 6

What model replaced the plum-pudding model?

Answer 6

nuclear model

Question 7

What do we call the centre of an atom?

Answer 7

the nucleus

Question 8

Why was gold foil used in the alpha scattering experiment?

Answer 8

It can be hammered into one atom thick strips

Question 9

What happened to most of the alpha particles in the alpha scattering experiment?

Answer 9

Passed straight through the gold foil without changing direction

Question 10

Who suggested that electrons orbit the nucleus at specific distance?

Answer 10

Niels Bohr

Question 11

What do we now call the “orbits” that surround an atom?

Answer 11

Engery shells/ levels

Question 12

What caused the positive charge of the nucleus?

Answer 12

Protons

Question 13

What did James Chadwick discover?

Answer 13

That the nucleus contained neutrons

Question 14

What charge do neutrons have?

Answer 14

0

Question 15

Why do atoms have no overall charge?

Answer 15

They have the same number of electrons as protons

Question 16

What is the radius of an atom?

Answer 16

1x10(-10)m

Question 17

What is he radius of the nucleus?

Answer 17

1x10(-14)m

Question 18

Where is most of the mass found in an atom?

Answer 18

The nucleus

Question 19

What are the relative masses of protons and neutrons?

Answer 19

1

Question 20

What charge does an electron have?

Answer 20

-1

Question 21

Which is the atomic number (proton number) on the periodic table?

Answer 21

The bottom number beneath the symbol

Question 22

Which is the relative atomic mass number (proton and neutron number) on the periodic table?

Answer 22

The top number above the symbol

Question 23

What is an isotope?

Answer 23

atoms of the same element that have the same number of protons and electrons but different numbers of neutrons

Question 24

What calculation is used to calculate relative formula mass?

Answer 24

Ram (relative atomic mass) = (% x mass number)+(% x mass number) ÷ 100