What is true about the average atomic mass?

It's a weighted average so common isotopes count for more

How do you calculate the number of neutrons in an atom?

You subtract the atomic number from the mass number

What did Democritus propose?

That universe was made of units that could not be divided

What statement about the nucleus is true?

The nucleus is made of protons & neutrons & is positive

Why do atoms have no electric charge even though they are made up of charged particles?

The protons and electrons are equal and cancel out

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Duplicate of Atoms

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A science quiz to review the atomic theory and structure of atoms

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Questions 15

Answers

1
Oxygen's atomic number is 8 so it's nucleus has...
8 neutrons and electrons
8 protons and neutrons
8 protons
8 neutrons
2
What is true about the average atomic mass?
It's equal to 1/12 the mass of the most common isotope
It's a weighted average so common isotopes count for more
Calculate it by counting the # of isotopes in an element
It's based on isotope's charge so negatives count for more
3
How do you calculate the number of neutrons in an atom?
You count the number of electrons
You add the atomic number and mass number
You multiply the atomic mass by a conversion factor
You subtract the atomic number from the mass number
4
What is the charge of a neutron?
No charge
Positive
Negative
Charged $6.50 each
5
what is the charge on a proton?
phone charger
Positive
no charge
Negative
6
What did Democritus propose?
That Greeks should control all atoms
That universe was made of units that could not be divided
That atoms were big
That each atom had a nucleus
7
What statement about the nucleus is true?
The nucleus is made of protons & neutrons & is negative
The nucleus is made of electrons and is negative
The nucleus is made of protons & neutrons & is positive
The nucleus is made of electrons and is positive
8
If an element has an atomic number of 2...
All of the above
It has to be Helium
It must have 2 protons
It probably has 2 electrons
9
What is the mass number?
Protons plus neutrons
Protons plus electrons
Neutrons
Protons
10
Why do atoms have no electric charge even though they are made up of charged particles?
The charges are not strong enough
There are not enough charges in the atom
The neutrons are heavier and cancel out the charge
The protons and electrons are equal and cancel out
11
Where is the neutron found in the atom?
in the nucleus
in the nucleolus
in the nucleoid
in the cloud
12
Who proposed the first theory of atoms?
Dalton
Democritus
Rutherford
Thompson
13
Where is the proton found in the atom?
in the nucleoid
in the nucleolus
in the cloud
in the nucleus
14
what is the charge on an electron
negative
no charge
over charged
Positive
15
where is the electron found in the atom?
in the neucleolus
in the nucleus
in the electron cloud
in the neucleoid

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