Atomic Structure

Question 1

When was John daltons atomic theory?

Answer 1

1805

Question 2

What was John daltons atomic theory?

Answer 2

• all matter is made up of tiny particle called atoms
• atoms are tiny hard spheres that cannot be broken down
• atoms can’t be created or destroyed
• the atoms in an element are identical

Question 3

When did JJ Thompson discover electrons?

Answer 3

1897

Question 4

What are atoms made out of?

Answer 4

Protons, neutrons and electrons

Question 5

What is the relative charge of protons?

Answer 5

+1

Question 6

What is the relative mass of protons?

Answer 6

1

Question 7

What is the relative charge of electrons?

Answer 7

-1

Question 8

What is the relative mass of an electron?

Answer 8

1/1835

Question 9

What is the relative charge of a neutron?

Answer 9

0 (no charge)

Question 10

What is the relative mass of a neutron?

Answer 10

1

Question 11

What do atoms in elements always have the same of?

Answer 11

Protons and electrons

Question 12

Where are protons and neutrons found?

Answer 12

The nucleus

Question 13

Where are electrons found?

Answer 13

In electron shells

Question 14

Why does the nucleus have no charge?

Answer 14

There is the same number of protons and electrons and the charges cancel each other out so it has no overall charge

Question 15

When did Rutherford discover most of the mass of the atom was in the nucleus?

Answer 15

1909

Question 16

What was Rutherfords experiment?

Answer 16

Tiny positive particles were fired at a thin gold foil. Most particles passed through foil straight away with a few being deflected and a small number bouncing back?

Question 17

How were atoms on the periodic table originally placed?

Answer 17

In order of the masses of their atoms

Question 18

How did the periodic tables order change?

Answer 18

Those with similar properties were grouped together

Question 19

Which number is the mass number?

Answer 19

The top one

Question 20

When was the neutron discovered?

Answer 20

1932

Question 21

Who discovered the neutron?

Answer 21

James Chadwick

Question 22

What is an isotope?

Answer 22

An atom of the same element with the same atomic number but different mass numbers

Question 23

How do we refer to a specific isotope?

Answer 23

By adding its mass number to the elements name

Question 24

How do we work out the relative atomic mass of an atom?

Answer 24

Relative atomic mass= total mass of the atoms/the number of atoms