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TOPIC 2 - Why are distress flares red? (Atoms)

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Total cards: 20•Content version: v3•Public deck•Updated: 8/1/2026

Card preview (20)

#1
Front (Question)

group 1

Back (Answer)

alkali metals

#2
Front (Question)

group 7

Back (Answer)

halogens

#3
Front (Question)

group 8/0

Back (Answer)

noble gases

#4
Front (Question)

columns are called

Back (Answer)

groups

#5
Front (Question)

rows are called

Back (Answer)

periods

#6
Front (Question)

the two liquid elements

Back (Answer)

Bromine and Mercury

#7
Front (Question)

air is 80%

Back (Answer)

nitrogen

#8
Front (Question)

air is 20%

Back (Answer)

oxygen

#9
Front (Question)

air is 0.04%

Back (Answer)

carbon dioxide

#10
Front (Question)

mass and charge and location of protons

Back (Answer)

1 amu, +1, nucleus

#11
Front (Question)

mass and charge and location of electrons

Back (Answer)

0 amu, -1, shell

#12
Front (Question)

mass and charge and location of neutrons

Back (Answer)

1 amu, 0, nucleus

#13
Front (Question)

number of protons =

Back (Answer)

atomic number = number of electrons

#14
Front (Question)

number of electrons =

Back (Answer)

atomic number = number of protons

#15
Front (Question)

atomic number =

Back (Answer)

number of protons = number of electrons

#16
Front (Question)

mass number =

Back (Answer)

number of protons + number of neutrons

#17
Front (Question)

number of neutrons =

Back (Answer)

mass number - atomic number

#18
Front (Question)

the number at the top in nuclide notation is

Back (Answer)

mass number

#19
Front (Question)

the number at the bottom in nuclide notation is

Back (Answer)

atomic number

#20
Front (Question)

ram =

Back (Answer)

ram = ((%abundance of isotope 1 x mass) + (%abundance of isotope 2 x mass)) /100