Why are atoms electrically neutral?

Protons and electrons cancel out each other’s charge.

When filling energy levels, you must:

Fill the lowest energy level before moving to the next

An atom of the same element with different amount of neutrons

What is Niels Bohr’s contribution to modern atomic theory?

Electrons are found in specific energy levels.

What did Rutherford conclude about the atom as a result of his Gold Foil experiment?

The atom is composed of mainly empty space.

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Atomic Structure Review

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Questions 20

Answers

1
Experiments with the cathode ray resulted in the discovery of electrons.
True
False
2
Which scientist discovered electrons?
JJ Thomson
Ernest Rutherford
John Dalton
Democritus
3
You cannot find the mass number on the periodic table.
False
True
4
How do you identify which element an atom is?
atomic number
mass number
number of electrons
charge
5
Why are atoms electrically neutral?
There are more protons than electrons in atoms.
Neutrons carry no charge.
The neutrons balance out any charge.
Protons and electrons cancel out each other’s charge.
6
The term “atomos” comes from the Greek philosopher named?
Aristotle
Socrates
Democritus
Galileo
7
When filling energy levels, you must:
Fill the lowest energy level before moving to the next
Spread the electrons as evenly as possible
Put one electron in each before doubling them up
Start with the highest energy level
8
Which part of Dalton's theory is not completely accurate?
Atoms combine in whole number ratios.
Atoms are indivisible.
Atoms can be combined, separated, or rearranged in reactions.
Atoms of one element differ from atoms of another element.
9
The mass of an atom is
does not include the electrons
all of these
is determined by adding the protons and neutrons
found in the nucleus of the atom
10
What is an isotope?
An atom of the same element with different amount of neutrons
An atom of the same element with a different amount of protons
An atom of different elements with the same number of neutrons
An atom of the same element with different amount of electrons
11
What is Niels Bohr’s contribution to modern atomic theory?
Electrons exist outside of the nucleus.
Electrons have a negative charge.
Electrons exist inside the nucleus.
Electrons are found in specific energy levels.
12
How many electrons does the following atom have?
7
9
20
11
13
What did Rutherford conclude about the atom as a result of his Gold Foil experiment?
The atom is a densely packed substance.
The atom is composed of mainly empty space.
Electrons float in a positively charged substance.
Protons are positively charged.
14
How many neutrons does the following atom have?
7
11
20
9
15
Which subatomic particle has a relative mass of zero?
Protons
Electrons
Neutrons
16
When an atom loses or gains electrons, the atom is called a(n)
isotope
molecule
ion
compound
17
What model of the atom is represented in this image?
Plum Pudding Model
Electron-Cloud Model
Chocolate Chip Cookie Model
Bohr’s Model
18
What model of the atom is represented in this image?
Chocolate Chip Cookie Model
Bohr’s Model
Electron-Cloud Model
Billiard Ball Model
19
What is true of the atom below?
It's charge is -14
It's mass is 14
It's number of electrons is -14
It's atomic number is 14
20
The number of protons is ALWAYS equal to the number of electrons.
True
False

Atomic Structure Review Flashcards | StudBud