SC3

Question 1

How have daltons ideas about atoms changed?

Answer 1

At the start of the 19th centuary dalton describes atoms as solid spheres. Thomson found that atoms werent solid spheres. His experiments showed there must be smaller parts

Question 2

What 4 parts make up a subatomic partivle

Answer 2

protons, electrons, nuetrons, electron shells

Question 3

How are atoms of differebt elements diffrent

Answer 3

Have different numbers of subatomis particles.

Question 4

What is the relative charge and mass of a proton

Answer 4

Relative charge: +1
Relative mass: 1

Question 5

What is the relative charge and mass of a electron?

Answer 5

Relativr charge: -1
Relative mass: 1/1835

Question 6

What is the relative charge and mass of a neutron

Answer 6

Relative charge: 0
Relative mass: 1

Question 7

Why do atoms have no overall charge?

Answer 7

Because atoms always have an equal number of protons and electrons. Charges cancles out

Question 8

Describe the size of an atom compared to the size of its nucleus

Answer 8

Tiny nuclues at the centre of all atoms. Surrounded by electron shells

Question 9

Where is most of the mass in an atom found?

Answer 9

In the nucleus

Question 10

What is the atomic number of an element

Answer 10

Number of protons only

Question 11

What is the mass number of an element?

Answer 11

number of protons and neutrons

Question 12

The atomis number of Na is 11. How many electrons does Na have.

Answer 12

11

Question 13

What is an isotope

Answer 13

Same element but different number of neutrons