Atoms and electrons

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Total cards: 15•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (15)

Front (Question)

Atomic number

Back (Answer)

number of protons in an atom of an element proton number

Front (Question)

Mass number

Back (Answer)

number or protons and neutrons in the nucleus of an element nucleon number

Front (Question)

Ion

Back (Answer)

electrically charged particle formed by loss or gain of electrons

Front (Question)

Isotopes

Back (Answer)

• atoms of same element • same atomic number • different mass number • same number of protons • different number of neutrons

Front (Question)

Relative isotopic mass

Back (Answer)

mass of an atom of an isotope compared with 1/12th mass of carbon-12

Front (Question)

Relative atomic mass

Back (Answer)

weighted mean mass of an element compared with 1/12th mass of carbon-12

Front (Question)

First ionisation energy

Back (Answer)

energy required to remove 1 electron from each atom in 1 mol of gaseous atoms to produce 1 mol gaseous 1+ions

Front (Question)

Orbital

Back (Answer)

• region of negative charge around the nucleus of an atom • can hold max 2 electrons • spin in opposite directions

Front (Question)

Draw electronic configurations up to 3D

Back (Answer)

#10

Front (Question)

Draw S orbitals

Back (Answer)

#11

Front (Question)

Draw P orbitals

Back (Answer)

#12

Front (Question)

Ground state

Back (Answer)

• how element naturally exists • electrons in lowest energy position

#13

Front (Question)

Evidence for electron shells

Back (Answer)

• Ionisation energy • large jumps in energy • electron is removed from shell nearer to nucleus

#14

Front (Question)

Relative molecular mass

Back (Answer)

average mass of one mol of of an element of compound compared to 1/12 mass of c12

#15

Front (Question)

Mean weighted mass

Back (Answer)

Mean average of isotopes atomic masses taking into account abundance