The atomic mass of an element is the …

weighted average of the masses of isotopes of the element.

Which is true about subatomic particles?

Protons and neutrons are almost equal mass and heaviest.

What determines the identity of an atom?

the atomic number, the number of protons in the nucleus

Which discovery did J. J. Thomson make that improved upon Dalton's atomic theory?

Atoms contain tiny, negatively charged particles.

total number of protons and neutrons in the nucleus

What is an atomic mass unit?

one-twelfth the mass of a carbon-12 atom

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Models of the Atom

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Questions 13

Answers

1
What are atoms with the same number of protons, but diff. numbers of neutrons in the nucleus?
atomic mass unit
isotopes
mass number
atomic number
2
The atomic mass of an element is the …
weighted average of the masses of isotopes of the element.
total number of subatomic particles in its nucleus.
average of the mass number and atomic number of the element.
total mass of the isotopes of the element.
3
An element has an atomic number of 76. An atom of the element contains …
76 protons and 76 electrons
76 protons and 0 electrons
152 protons and 76 electrons
38 protons and 38 electrons
4
What are the number of protons and number of neutrons for this element: ₃⁷Li
7 protons, 3 neutrons
3 protons, 4 neutrons
3 protons, 7 neutrons
4 protons, 3 neutrons
5
Which is true about subatomic particles?
Protons and neutrons are almost equal mass and heaviest.
Electrons are negatively charged and the heaviest particle.
Neutrons have no charge and are the lightest particle.
Protons are positive and the lightest particle.
6
What determines the identity of an atom?
the isotope number
the mass number
the atomic number
the number of protons in the nucleus
7
Which is a negatively charged subatomic particle?
nucleus
proton
electron
atom
8
Which discovery did J. J. Thomson make that improved upon Dalton's atomic theory?
Atoms combine in simple, whole-number ratios.
Atoms are always in motion.
Atoms contain tiny, negatively charged particles.
Atoms contain a tiny, positive nucleus.
9
Which is the smallest particle of an element that retains the properties of that element?
atom
proton
electron
nucleus
10
Particles in the nucleus are …
neutrons and electrons
protons and electrons
protons, neutrons, and electrons
protons and neutrons
11
What is mass number?
unit of mass for measuring atoms
weighted average of the masses of all isotopes of an element
total number of protons in the nucleus
total number of protons and neutrons in the nucleus
12
An isotope has atomic number 8 and mass number 17. How many protons and neutrons does it have?
17 protons, 8 neutrons
8 neutrons, 9 protons
8 protons, 17 neutrons
8 protons, 9 neutrons
13
What is an atomic mass unit?
weighted average of the mass of all isotopes of an element
one-twelfth the mass of a carbon-12 atom
total number of protons in the nucleus
total number of protons and neutrons in the nucleus

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