Atomic Structure (Chemistry)

Question 1

What did Neils Bohr discover?

Answer 1

That electrons orbited the nucleus at specific distances, called shells

Question 2

What subatomic particles have no charge?

Answer 2

Neutrons

Question 3

What number tells us how many protons there are in an atom?

Answer 3

The atomic number

Question 4

What subatomic particles have a charge of +1?

Answer 4

Protons

Question 5

The discovery of what lead to scientists not accepting the Dalton model of the atom anymore?

Answer 5

Electrons, as they were smaller than the atom.

Question 6

What is the smallest part of an element that can exist?

Answer 6

An atom

Question 7

Why do scientists know that the Dalton model of the atom isn’t correct?

Answer 7

Other scientists have done many experiments to show the Dalton Model doesn’t fit

Question 8

What does the mass number tell us about the atom?

Answer 8

The number of protons PLUS the number of neutrons.

Question 9

What word means the same as electron shell?

Answer 9

energy level

Question 10

How many different elements are there?

Answer 10

About 100

Question 11

What is the relative mass of an electron?

Answer 11

0

Question 12

How are compounds formed?

Answer 12

From chemical reactions where bonds are broken and then reformed.

Question 13

What is a substance made of only one type of atom?

Answer 13

An element

Question 14

What are the 3 forms that substances can exist in?

Answer 14

Elements Compounds Mixtures

Question 15

What did James Chadwick discover?

Answer 15

The neutrons in the nucleus

Question 16

What can never be the same for 2 different elements?

Answer 16

The atomic number, or the number of protons.

Question 17

What is the plum pudding model of the atom?

Answer 17

A ball of positive charge with negative electrons studded into it.

Question 18

How many letters are there in a chemical symbol?

Answer 18

One or two depending on the element.

Question 19

What is the charge of an electron?

Answer 19

negative 1 (-1)

Question 20

What subatomic particles have a charge of -1?

Answer 20

Electrons

Question 21

What experiment disproved the plum pudding model?

Answer 21

The gold foil experiment

Question 22

What model became accepted after the gold foil experiment?

Answer 22

The nuclear model

Question 23

What was the first model of the atom called?

Answer 23

The Dalton Model

Question 24

What is the charge of a proton?

Answer 24

positive 1 (+1)

Question 25

Name the 3 subatomic particles.

Answer 25

Protons, neutrons and electrons

Question 26

What are all substances made from?

Answer 26

Atoms

Question 27

Does separating a mixture involve a chemical reaction? Explain.

Answer 27

No, it doesn't involve a chemical reaction because no chemical bonds are being made or broken.

Question 28

Who discovered neutrons?

Answer 28

James Chadwick

Question 29

What does the Dalton Model of the atom look like?

Answer 29

A sphere that can't be made any smaller

Question 30

Why are atoms neutral?

Answer 30

They have the same number of protons as electrons.

Question 31

What is the charge of a neutron?

Answer 31

Neutral or No Charge

Question 32

Which subatomic particle can tell us the identity of an atom?

Answer 32

The number of protons

Question 33

What is involved in a chemical reaction?

Answer 33

The formation of one or more new substances and an energy change.

Question 34

What came after the discovery of electron shells?

Answer 34

The discovery of protons, that the nucleus wasn't one big positive charge, but many smaller posive charges.

Question 35

What did the gold foil experiment (alpha particle scattering) prove?

Answer 35

That atoms have nucleuses with a positive charge.

Question 36

What is the relative mass of a proton?

Answer 36

1

Question 37

What is an atom?

Answer 37

The smallest part of an element that can exist.

Question 38

What is a mixture

Answer 38

A substance made of more than one thing not chemically bonded together.

Question 39

How many electrons can fit in the first shell?

Answer 39

2

Question 40

Where do we find all the different elements?

Answer 40

On the periodic table.

Question 41

What is the relative mass of a neutron?

Answer 41

1

Question 42

How many electrons can fit in the 3rd shell?

Answer 42

8

Question 43

What is an element?

Answer 43

A substance made of only one type of atom.

Question 44

How many electrons can fit in the second energy level?

Answer 44

8

Question 45

How do we figure out how many neutrons there are in an atom?

Answer 45

Mass number - atomic number

Question 46

Who discovered electron shells?

Answer 46

Neils Bohr

Question 47

What is a molecule?

Answer 47

A substance made of more than one atom chemically bonded together.

Question 48

What are the 2 numbers you see on the periodic table for each element?

Answer 48

The atomic number (smaller) and the mass number (bigger)

Question 49

What does the atomic number tell us about the atom?

Answer 49

The number of protons in the atom

Question 50

What is a substance made from two or more different atoms chemically bonded together?

Answer 50

A compound.

Question 51

What subatomic particles have a neutral charge?

Answer 51

Neutrons

Question 52

What subatomic particles have a relative mass of 1? (2)

Answer 52

Protons and Neutrons

Question 53

How can mixtures be separated? (5)

Answer 53

Filtration, crystallization, simple distillation, fractional distillation, chromatography

Question 54

What was the name of the model which explained electrons embedded in a positive atom?

Answer 54

The plum pudding model

Question 55

What sub atomic particle has no relative mass?

Answer 55

An electron

Question 56

What is a compound?

Answer 56

A substance made of two or more different atoms chemically bonded together.