What Is an Atom

What do we call the simplified model that we use to show atoms when learning GCSE chemistry?

• Bohr model

• Circular model

• Electron cloud

• plum pudding model

If a nitrogen nucleus was the size of a common house spider (about 3cm) how big would the entire atom be?

• 10 football pitches

• 1 football pitch

• 10cm

• 1000cm

Which of the following is the smallest atom in size?

• Carbon

• Nitrogen

• Hydrogen

• Oxygen

Answer explanation

Hydrogen is the smallest atom in size of all the atoms (it has only one proton and one electron).

An ______ the very basic unit of matter.

• element

• atom

• atomic number

• atomic mass

The Atomic Theory: All elements are made up of tiny particles called ___________.

• atoms

• alike

• different

• chemical

• physical

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Who first thought of the idea of the atom, nearly 2,000 years ago?

• Demetry Mendeleyev

• John Dalton

• Democritus

The Atomic Theory: Atoms of a given element are ____.

• atoms

• alike

• different

• chemical

• physical

What is the smallest part of an element that retains its chemical properties?

• Atom

• Molecule

• Compound

• Mixture

Which subatomic particle is found in the nucleus of an atom?

• Electron

• Proton

• Neutron

• Photon

What is the charge of an electron?

• Positive

• Negative

• Neutral

• Variable

Tags

NGSS.MS-PS2-3