Thomson said atoms have

negatively charged electrons set in a positive sphere.

What did Ernest Rutherford help contribute

atoms are mostly empty space with a dense center

Dalton's work on the atom is considered a theory because...

Dalton's ideas followed the scientific method

what is a mass number?

the total number of protons and neutrons in a nucleus

Atoms of the SAME element that have extra NEUTRONS

The atomic mass of an element depends upon the ...

The masses and relative abundance of each isotope

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

Subtract the atomic number from the mass number

weighted average mass of mixture of an element's isotopes

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Chapter 4 Review

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Answers

1
All atoms of the same element have the same number of ____?
mass number
protons
electrons
neutrons
2
Thomson said atoms have
negatively charged electrons set in a positive sphere.
really, really small baby atoms.
no way to be cut into smaller parts.
the same mass.
3
What did Ernest Rutherford help contribute
electrons occupy quantized energy levels
atoms are mostly empty space with a dense center
Atoms are indivisible
found the charge of electrons were negative
4
What does the number 84 represent in krypton-84?
atomic number
sum of protons and electrons
number of electrons
mass number
5
What is the average atomic mass of these isotopes? Helium-4 (99%) and Helium-5 (1%)
4.5000 amu
9.0000 amu
4.9999 amu
4.0001 amu
6
Which subatomic particle is the lightest?
Neutrons
Protons
Electrons
7
Dalton's work on the atom is considered a theory because...
Dalton's models of the atom were more detailed
Dalton's ideas were correct
Dalton proved Democritus was wrong
Dalton's ideas followed the scientific method
8
What instrument can be used to observe individual atoms?
X-ray machine
Optical telescope
Scanning electron microscope
Light microscope
9
Atomic Number?
9
10
7
8
10
what is a mass number?
the number of protons in the nucleus of an atom
the total number of protons and neutrons in a nucleus
a number greater than one that can not be multiplied
around outside of nucleus
11
What are isotopes?
Electrons gained or lost that causes an atom to gain energy
Atoms of DIFFERENT elements that have extra ELECTRONS
Atoms of the SAME element that have extra NEUTRONS
Atoms of the SAME element that have extra PROTONS
12
What subatomic particle did Thomson discover?
Quark
Proton
Electron
Neutron
13
What did Goldstein discover?
nucleus
neutron
electron
proton
14
The atomic mass of an element depends upon the ...
mass of each isotope of that element
The masses and relative abundance of each isotope
The relative masses of protons and neutrons
mass of each electron
15
How do you calculate the number of neutrons in an atom?
Subtract one from the mass number
Subtract the atomic number from the mass number
Add the atomic number and the mass number
Double the atomic number
16
Which scientist used the Cathode Ray Tube Experiment
Rutherford
Democritus
Milliken
Thomson
17
what did Democritus do?
he called the tiny particles "atomos"
all of the above
he developed the idea of atoms
he pounded materials into smaller and smaller particles
18
average atomic mass
mass of an atom in an element
weighted average mass of mixture of an element's isotopes
particles of matter that make up protons and neutrons
substance with atoms that are all alike
19
What was Rutherford trying to prove?
Dalton's Atomic Theory
Planetary Model
Plum Pudding Model
Electron Cloud Model
20
The cathode ray can be deflected by a magnetic field because the ray particles have a _ charge?
neutral
purple
negative
positive

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