Atomic Model GCSE Combined Science Chemistry Edexcel Higher

Development of atomic models, the atom, defining isotopes and more.

Who discovered protons and neutrons in what year?

In 1932, James Chadwick discovered protons and neutrons.

Who discovered electrons and in what year?

JJ Thomson discovered electrons in 1897.

What is the charge of a proton?

+1 charge.

What is the charge for neutrons?

0 (neutral)

What is the charge for electron?

-1 charge.

What is the mass for proton?

1.

What is the mass for neutron?

1.

What is the mass for electron?

0.0005.

What are the subatomic particles?

Protons, neutrons and electrons.

Where is protons and neutrons found in?

The nucleus.

What is the atomic number of an atom?

It is the number of protons in the nucleus.

What is the mass of an atom?

It is the total number of protons and neutrons in the nucleus.

Why does an atom contains an equal amount of protons and electrons in an atom?

Protons and neutrons have equal opposite charges, this means they cancel each other out/ they are neutral overall. 

What is the number of protons equal to?

The atomic number.

What is the number of electrons equal to?

The atomic number.

What is the number of neutrons equal to?

Mass number-atomic number.

Who discovered the nucleus and what year?

In 1909, Ernest Rutherford discovered the nucleus in the atom.

Define isotopes.

Atoms of the same element that has the same number of protons ( atomic number) but different number neutrons (atomic mass) in the nuclei.

What are the three isotopes of hydrogen?

Protium, deuterium and tritium.

How many protons, neutrons and electrons does protium have?

Protons=1

Neutrons=0

Electrons=1

How many protons, neutrons and electrons does deuterium have?

Protons=1

Neutrons=1

Electrons=1

How many protons, neutrons and electrons does tritium have?

Protons=1

Neutrons=2

Electrons=1

What is the most common isotopes of hydrogen?

Protium.

What is the least common isotopes of hydrogen?

Tritium.

What is the relative atomic mass of the element?

The relative atomic mass of the element is the weighted average of the relative atomic masses of isotopes in the element.

How do you calculate the relative atomic mass?

Ar=Total mass of atoms/Total number of atoms.

What is the symbol for relative atomic mass?

Ar.

What is the symbol for relative formula mass?

Mr.

What is the relative formula mass?

The relative formula mass is the sum of relative atomic masses in the numbers.

How do you calculate the percentage of an element in a compound by mass?

% of an element=Mass of an element in the compound/Relative formula mass times 100.

What is the mass of one mole?

The mass of one mole of any substances is numerically equal to it’s relative formula mass or relative atomic mass.

How do you calculate the emperical formula?

By using MADR.

What is the law of conservation of mass?

Atoms cannot be created or destroyed in a chemical reaction. Instead they join together in a different way then before the reaction. This means that the total mass of products in a chemical reaction is the same as total mass of reactants.

What is the word equation for calculating the concerntration of a solution?

Concerntration in g dm-3=Mass of solutes in g/Volume in dm3.

What is cm3 to dm3?

Divide by 1000.

What is dm3 to cm3?

Times by 1000.

How can you calculate the concerntration of dissolved solute?

By using the dissolved solutes in grams.

The volume of solution in decimetres cube.

How is a solution formed?

A solution is formed when a solute is dissolved in a solvent.