Atoms

Question 1

What is the smallest unit of matter?

Answer 1

Atom

Question 2

True or False: Atoms can be created or destroyed in a chemical reaction.

Answer 2

False

Question 3

What are the three main subatomic particles found in an atom?

Answer 3

Protons, neutrons, and electrons

Question 4

Fill in the blank: The nucleus of an atom contains ______ and ______.

Answer 4

Protons and neutrons

Question 5

What is the charge of an electron?

Answer 5

Negative

Question 6

What determines the atomic number of an element?

Answer 6

The number of protons in the nucleus

Question 7

Which particle has a mass approximately 1 atomic mass unit (amu)?

Answer 7

Proton

Question 8

True or False: Neutrons have no charge.

Answer 8

True

Question 9

What is the term for atoms of the same element with different numbers of neutrons?

Answer 9

Isotopes

Question 10

What is the maximum number of electrons that can occupy the first energy level of an atom?

Answer 10

2

Question 11

Which type of bond involves the sharing of electron pairs between atoms?

Answer 11

Covalent bond

Question 12

What type of bond is formed when electrons are transferred from one atom to another?

Answer 12

Ionic bond

Question 13

Fill in the blank: The periodic table is arranged by increasing ______.

Answer 13

Atomic number

Question 14

What are groups in the periodic table?

Answer 14

Columns of elements with similar properties

Question 15

What are periods in the periodic table?

Answer 15

Rows of elements indicating energy levels

Question 16

True or False: Noble gases are highly reactive.

Answer 16

False

Question 17

What is the main characteristic of metals on the periodic table?

Answer 17

They are good conductors of heat and electricity.

Question 18

Which scientist is credited with creating the first periodic table?

Answer 18

Dmitri Mendeleev

Question 19

What is the significance of the periodic law?

Answer 19

Elements show periodic properties when arranged by atomic number.

Question 20

What is an ion?

Answer 20

An atom or molecule with a net electric charge due to the loss or gain of electrons.

Question 21

What is the primary factor that determines the chemical properties of an element?

Answer 21

The electron configuration

Question 22

Fill in the blank: The outermost electrons are known as ______ electrons.

Answer 22

Valence

Question 23

What happens to the atomic radius as you move down a group in the periodic table?

Answer 23

It increases.

Question 24

What happens to the electronegativity as you move from left to right across a period?

Answer 24

It increases.

Question 25

True or False: Alkali metals are located in Group 1 of the periodic table.

Answer 25

True

Question 26

What is a chemical bond?

Answer 26

A lasting attraction between atoms that enables the formation of chemical compounds.

Question 27

What is the difference between an ionic bond and a covalent bond?

Answer 27

Ionic bonds involve transfer of electrons, while covalent bonds involve sharing of electrons.

Question 28

What is a molecule?

Answer 28

A group of atoms bonded together.

Question 29

True or False: Nonmetals typically gain electrons during chemical reactions.

Answer 29

True

Question 30

What are transition metals?

Answer 30

Elements found in groups 3-12 of the periodic table, characterized by d-electrons.

Question 31

Fill in the blank: The most reactive group of nonmetals is the ______.

Answer 31

Halogens

Question 32

What is the Pauli exclusion principle?

Answer 32

No two electrons in an atom can have the same set of four quantum numbers.

Question 33

What does the term 'valence shell' refer to?

Answer 33

The outermost shell of an atom containing the valence electrons.

Question 34

What is the definition of an isotope?

Answer 34

Atoms of the same element with different numbers of neutrons.

Question 35

What is the role of a neutron in an atom?

Answer 35

To provide stability to the nucleus.

Question 36

What does the term 'atomic mass' refer to?

Answer 36

The weighted average mass of an atom of an element based on the abundance of its isotopes.

Question 37

Fill in the blank: The periodic table is divided into ______, ______, and ______.

Answer 37

Metals, nonmetals, and metalloids

Question 38

Size of an atomic nuckeus compared to an atom

Answer 38

1/10,000

Question 39

What do the number of shells mean in a atom

Answer 39

Which period

Question 40

Whats an element

Answer 40

Particle made of 1 type of atom

Question 41

Whats a compund

Answer 41

2 or more elements chemically bonded together IN FIX PROPORTIONA

Question 42

What are displacement reaction

Answer 42

When a more stronger reactive element displaces or pushes out a less stronger element from a compound that contians a less reactiv elememt