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Atomic structure and isotopes - 2.1 - (1)

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Total cards: 24•Content version: v3•Public deck•Updated: 8/1/2026

Card preview (24)

#1
Front (Question)

What does the atom consist of?

Back (Answer)

a nucleus made up of two types of subatomic particles = protons and neutrons

#2
Front (Question)

What is the third type of subatomic particle?

Back (Answer)

an electron which occupies a region outside the nucleus

#3
Front (Question)

How are electrons arranged?

Back (Answer)

around the nucleus in shells

#4
Front (Question)

What kind of masses do atoms and their subatomic particles have?

Back (Answer)

tiny masses

#5
Front (Question)

What do chemists use instead of working in grams?

Back (Answer)

they compare the masses of subatomic particles using relative masses

#6
Front (Question)

What virtually has the same mass as a neutron?

Back (Answer)

proton

#7
Front (Question)

What is the negligible mass of an electron?

Back (Answer)

1/1836th the mass of a proton

#8
Front (Question)

What do accurate measurements show?

Back (Answer)

a neutron has a slightly greater mass than a proton

#9
Front (Question)

By which factor is a neutron slightly greater than a proton?

Back (Answer)

1.001375

#10
Front (Question)

What do chemists assume after they see that neutrons have a slightly greater mass than protons by the factor suggested?

Back (Answer)

this is close to 1 that chemists usually assume that protons and neutrons have the same mass

#11
Front (Question)

What type of subatomic particle has a positive charge?

Back (Answer)

proton

#12
Front (Question)

What type of subatomic particle has a negative charge?

Back (Answer)

electron

#13
Front (Question)

The charge on a proton…

Back (Answer)

is equal but opposite to the charge on an electron - the charges balance

#14
Front (Question)

What type of subatomic particle has no charge?

Back (Answer)

neutron

#15
Front (Question)

What is the actual charge on a single proton that is tiny?

Back (Answer)

+1.60217733 x 10^-19C

#16
Front (Question)

What is a much easier way instead of using actual charges?

Back (Answer)

relative charges

#17
Front (Question)

What is the relative charge for a proton?

Back (Answer)

1+

#18
Front (Question)

What is the relative charge for an electron?

Back (Answer)

1-

#19
Front (Question)

Nearly all of an atom’s…

Back (Answer)

mass is in the nucleus

#20
Front (Question)

What do atoms contain the same number of?

Back (Answer)

protons and electrons

#21
Front (Question)

What is cancelled by the total negative charge from electrons?

Back (Answer)

the total positive charge from protons

#22
Front (Question)

What is the overall charge of an atom?

Back (Answer)

zero

#23
Front (Question)

Is an atom neutral?

Back (Answer)

yes

#24
Front (Question)

What are neutrons thought to be as for the nucleus?

Back (Answer)

as a glue that holds the nucleus together despite the electrostatic repulsion between its positively charged protons