Structure Of The Atom YEAR TEN

Question 1

In Thompsons experiment how did he show the electrons had a negative charge?

Answer 1

The electron beam was attracted towards the positive plate therefore they must be negatively charged. The particles were approximately 2000 times lighter than hydrogen atom and he called them electrons

Question 2

How did Thomson suggest that the atom was neutral

Answer 2

It contained equal numbers of positive and negative charges and these cancelled each other out

Question 3

How does the mass of a neutron compare with the mass of a proton

Answer 3

Mass of neutron (1) is equal to the mass of a proton (1)

Question 4

How is the atom composed

Answer 4

Atom is composed of small, dense, positively, charged nucleus at the centre composed of protons and neutrons (most of the mass) with negatively charged electrons in shells orbiting the nucleus

Question 5

What’s the relative mass of a proton

Answer 5

1

Question 6

Relative mass of a neutron

Answer 6

1

Question 7

Relative mass of a electron

Answer 7

1/1840

Question 8

Relative charge of. A proton and neutron

Answer 8

Proton =+1
Neutron= 0

Question 9

Relative charge of a electron

Answer 9

-1

Question 10

How big is the radius of a atom

Answer 10

0.1nm

Question 11

How big is the radius of a nucleus of an atom compared to the radius of an atom

Answer 11

1/10,000 of the radius of a atom

Question 12

What is the definition of the atomic number

Answer 12

This is the number of protons in (the nucleus of) an atom

Question 13

What’s the definition of the mass number

Answer 13

This is the total number of protons and neutrons in (the nucleus of) an atom

Question 14

How do the atoms of one element differ from those of another

Answer 14

The number of protons electrons + neutrons found in each atom are different

Question 15

What’s the definition of a element

Answer 15

Element is a substance that consists of only one type of atom and it cannot be broken down into anything simpler by chemical means

Question 16

The number of protons in a atom is equal to its

Answer 16

Atomic number

Question 17

As an atom is electrically neutral (no overall charge) then the number of

Answer 17

Electrons must equal the number of protons

Question 18

The number of neutrons in an atom is equal to its

Answer 18

Mass no- atomic number

Question 19

Atoms with electric charges are called

Answer 19

Ions

Question 20

Atoms with positive charges are called

Answer 20

Cation

Question 21

Atoms with a negative charged are called

Answer 21

Anions

Question 22

What’s the formation of a cation

Answer 22

It’s the loss of electrons ( the symbol is +)

Question 23

What’s the formation of anions

Answer 23

It’s gaining electrons (symbol is -)

Question 24

What are isotopes

Answer 24

Isotopes are atoms which has The same number of protons (so they are atoms of the same element) but they have different number of neutrons (so they have a different mass number)

Question 25

How do you calculate isotopes

Answer 25

(It’s the percentage times the top number + the same again ) that equation divided by 100 gives you the answer

Question 26

How do you identify isotopes

Answer 26

It needs the same protons and electrons and different neutrons

Question 27

What’s not found in the nucleus of an atom

Answer 27

The electrons

Question 28

How is the periodic table arranged

Answer 28

By atomic number

Question 29

If an element has an atomic number of 12 how many protons and electrons does it have

Answer 29

12

Question 30

What did jj Thompson propose

Answer 30

The plum pudding model which stated that the negative electrons were embedded in a positive sphere (like the raisins in a plum pudding)

Question 31

What did Aristotle propose

Answer 31

He believed that matter was composed by four elements air fire earth and water