Ch.15 Atoms Test

The atomic number of fluorine is 9 and its mass number is 19, so it has _______ neutrons

10 neutrons

Compared to the mass of a hydrogen atom, the mass of an oxygen atom is ________ times greater

16 times greater

Magnesium: Atomic #12 How many electrons are in it's third level?

2

Sodium has a total of 11 electrons. The number of electrons in the first energy level of sodium is

2

If lithium has a mass number of 7 and an atomic number of 3, a lithium atom contains __protons, __ neutrons, and ___electrons

3 protons, 4 neutrons, 3 electrons

A certain atom has 26 protons, 26 electrons, and 30 neutrons. Its mass number is _______

56

Aluminum: Atomic #13 How many electrons are in it's second level?

8

The average of all the masses of the isotopes of a particular element

Atomic mass

If a pair of helium nuclei are fused together, the results is ________

Beryllium

Carbon: Symbol Atomic number Number of protons Number of neutrons Mass number

C 6 6 6 12

If two protons are removed from an oxygen nucleus, the result is ______

Carbon

What is it that electrons have that protons always have in equal magnitude?

Charge

Chlorine-37: Symbol Atomic number Number of protons Number of neutrons Mass number

Cl 17 17 20 37

Chlorine-35: Symbol Atomic number Number of protons Number of neutrons Mass number

Cl 17 17 18 35

Copper: Symbol Atomic number Number of protons Number of neutrons Mass number

Cu 29 29 35 64

Atomic particles found in energy levels outside the nucleus

Electrons

Each energy level of an atom has a max number of _____ it can hold

Electrons

The chemical properties of matter comes mostly from its

Electrons

An electric force between the nucleus of an atom and its electrons causes the _________ to move in an orbit around the _________

Electrons to move in an orbit orbit around the nucleus

Some alpha particles fired through a gold foil bounce backward by _____

Electrostatic repulsion when close to gold nuclei

Iron: Symbol Atomic number Number of protons Number of neutrons Mass number

Fe 26 26 30 56

Helium: Symbol Atomic number Number of protons Number of neutrons Mass number

He 2 2 2 4

If one neutron is added to a helium nucleus, the result is _____

Helium

Atoms of the same element with different numbers of neutrons are called _______

Isotopes

Atoms whose nuclei contain the same number of protons but different numbers of neutrons

Isotopes

Which has the greatest number of protons in its nucleus? Gold Mercury Lead Silver

Lead

The sum of the protons and neutrons in the nucleus of a particular kind of atom

Mass number

The Bohr model of the atom is similar to a

Miniature solar system

Because atoms are too small to study directly ,scientists use ________ to study them

Miscroscopes

Nitrogen: Symbol Atomic number Number of protons Number of neutrons Mass number

N 7 7 7 14

Sodium: Symbol Atomic number Number of protons Number of neutrons Mass number

Na 11 11 12 23

To change mercury into gold, a pair of protons must be: removed from the mercury nucleus or added to the mercury nucleus?

Neither of these.

If two protons are added to an oxygen nucleus, the result is _________

Neon

Which of the following are electrically neutral? Proton Neutron Electron

Neutron

Atomic particles that are electrically neutral

Neutrons

Atoms heavier than hydrogen were made by

Nuclear fusion

Atoms heavier than hydrogen were made by __________

Nuclear fusion

Oxygen: Symbol Atomic number Number of protons Number of neutrons Mass number

O 8 8 8 16

In an electrically neutral atom, the number of protons in the nucleus is balanced by an equal number of _____

Orbital electrons

In an electrically neutral atom, the number of protons in the nucleus is balanced by an equal number of ________

Orbital electrons

Dot diagrams are used to represent _________

Outer electrons

Because the nucleus of an atom contains protons, it has a _______ charge

Positive

One atomic mass unit describes the mass of a ________ or _______

Proton Neutron

The nucleus of an atom is made up of _____ and ______

Protons and neutrons

The mass of an atom, in atomic mass units, is equal to the number of ________ and __________ in its __________

Protons and neutrons in its nucleus

The atomic number of an element tells how many _________ are in the ________

Protons are in the nucleus

Which is the smallest particle listed below? Molecule Atom Proton Neutron Quark

Quark

Which is the smallest particle listed below? Molecule Atom Proton Neutron Quark

Quark

Particles of matter that make up protons and neutrons are ______

Quarks

Brownian motion has to do with the ________

Random motions of atoms and molecules

Sulfur: Symbol Atomic number Number of protons Number of neutrons Mass number

S 16 16 16 32

Assuming all the atoms exhaled by Julius Caesar in his last dying breath are still in the atmosphere, then we probably breathe one of those atoms with each

Single breath

Electrons differ from protons and neutrons because electrons have a much ________ mass

Smaller

If we doubled the magnifying power of the most powerful optical microscope in the world, we would_______

Still not be able to see an atom

One or two letters used to represent an atom of a particular element

Symbol

What makes an element distinct?

The number of neutrons

J.J Thompson's discovery of negatively charged particles in atoms indicated that

There are particles smaller than atoms

T or F: There are only about 100 different kinds of atoms that combine to form all substances

True

How many different elements are in a water molecule?

Two

Which of these atoms has the greatest number of electrons: Helium Carbon Iron Gold Uranium

Uranium

Which of these atoms has the most mass? Hydrogen Uranium Lead Iron

Uranium

There are about and many atoms of air in our lungs at any moment as there are breaths of air in the atmosphere of the

Whole world

Nuclei of atoms that make up a newborn baby were made in the

ancient stars

A particle that moves around the nucleus is a(n)

electron

The volume of matter comes mostly from its

electrons

The reason a granite block is mostly empty space is because the atoms in the granite are

mostly empty space themselves

A chemical symbol represents the _____ of an element

name

Solid matter is mostly empty space. The reason solids don't fall through one another is because ______

of electrical forces.

Since boron has an atomic number of five, it has five _______

protons

The weight of matter comes mostly from it's ______

protons

Compared to the atoms that make up the body of an elderly person, the atoms that make up the body of a newborn baby are the _______

same age

Most alpha particles fired at gold foil pass through undeflected because _________

the atoms of gold, like any other, are mostly empty space