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Atoms

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (24)

#1
Front (Question)

Average size of an atom

Back (Answer)

100 picometers

#2
Front (Question)

Proton

Back (Answer)

Positive nucleon with mass of 1

#3
Front (Question)

Neutron

Back (Answer)

Neutral nucleon with mass of 1.

#4
Front (Question)

Electron

Back (Answer)

A negative subatomic particle situated on a shell of an atom with a relative mass of 1/2000

#5
Front (Question)

Nucleon

Back (Answer)

Subatomic particles situated in the nucleus of an atom

#6
Front (Question)

Mass number

Back (Answer)

Number of protons and neutrons

#7
Front (Question)

Atomic number

Back (Answer)

Number of protons

#8
Front (Question)

How many protons are there in comparison to electrons in a neutral atom?

Back (Answer)

The number of electrons always equal the number of protons in a neutral atom

#9
Front (Question)

What happens if there’s an unequal number of electrons to protons?

Back (Answer)

The atom becomes charged and is an ion

#10
Front (Question)

Isotope

Back (Answer)

Different atomic forms of the same element, which have the same proton number but a different number of neutrons. (Same proton number but different mass numbers).

#11
Front (Question)

Molecule

Back (Answer)

A group of atoms

#12
Front (Question)

Relative atomic mass

Back (Answer)

The weighted mean mass of an atom. (Rounded to nearest 0.5 in periodic tables)

#13
Front (Question)

Relative abundance

Back (Answer)

How much there is of each isotope compared to the total amount of the element in the world. (Ratio, fraction or percentage).

#14
Front (Question)

First atomic model theory

Back (Answer)

Dalton’s billiard ball (1800’s)

#15
Front (Question)

What did Dalton’s billiard ball show?

Back (Answer)

All matter is made of atoms that can’t be broken down. Different elements are different atoms. Atoms are rearranged in chemical reactions. Compounds are two or more atoms joined.

#16
Front (Question)

What was the second atomic model?

Back (Answer)

JJ Thompson’s plum pudding (1900’s)

#17
Front (Question)

What did the plum pudding model show?

Back (Answer)

That there was negative subatomic particles within the atom.

#18
Front (Question)

What was the third atomic model?

Back (Answer)

Rutherford’s nuclear atom 1900’s

#19
Front (Question)

What did Rutherford’s nuclear atom show?

Back (Answer)

That there was a nucleus within the atom.

#20
Front (Question)

What was the fourth atomic model?

Back (Answer)

Bohr’s electron orbits

#21
Front (Question)

What did Bohr’s model show?

Back (Answer)

That electrons had orbits. That there were neutrons and free space within the atom.

#22
Front (Question)

Who Carried out the gold foil experiment and when?

Back (Answer)

Geiger and Marsden (Rutherford’s assistants) in 1911

#23
Front (Question)

What did the gold foil experiment compose of?

Back (Answer)

A vacuum with alpha radiation, a piece of gold foil and a detector

#24
Front (Question)

Why was it a vacuum in Geiger and Marsden’s experiment?

Back (Answer)

So that air particles wouldn’t get in the way