atoms

Question 1

What is the smallest unit of an element?

Answer 1

Atom

Question 2

What are protons, neutrons, and electrons collectively known as?

Answer 2

Subatomic particles

Question 3

True or False: Protons have a negative charge.

Answer 3

False

Question 4

What is the charge of an electron?

Answer 4

Negative

Question 5

What is the center of an atom called?

Answer 5

Nucleus

Question 6

Fill in the blank: The number of protons in an atom determines its ______.

Answer 6

Atomic number

Question 7

Which subatomic particle has no charge?

Answer 7

Neutron

Question 8

What is the mass number of an atom?

Answer 8

The sum of protons and neutrons

Question 9

True or False: Electrons are found in the nucleus of an atom.

Answer 9

False

Question 10

What do you call atoms of the same element with different numbers of neutrons?

Answer 10

Isotopes

Question 11

Which element has the atomic number 1?

Answer 11

Hydrogen

Question 12

What is the periodic table?

Answer 12

A tabular arrangement of elements based on atomic number

Question 13

What are the vertical columns in the periodic table called?

Answer 13

Groups or families

Question 14

What are the horizontal rows in the periodic table called?

Answer 14

Periods

Question 15

True or False: Noble gases are highly reactive.

Answer 15

False

Question 16

What do elements in the same group have in common?

Answer 16

Similar chemical properties

Question 17

What is the most abundant element in the universe?

Answer 17

Hydrogen

Question 18

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

Answer 18

Atomic number

Question 19

What is the name of the element with the symbol ‘O’?

Answer 19

Oxygen

Question 20

Which group of the periodic table contains alkali metals?

Answer 20

Group 1

Question 21

What is the significance of the atomic number?

Answer 21

It identifies the element and determines its position in the periodic table.

Question 22

True or False: Metals are typically good conductors of electricity.

Answer 22

True

Question 23

What is an ion?

Answer 23

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

Question 24

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

Answer 24

Covalent bond

Question 25

What is the primary difference between ionic and covalent bonds?

Answer 25

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

Question 26

Fill in the blank: The atomic mass of an element is the weighted average of the ______ of its isotopes.

Answer 26

Mass numbers

Question 27

What is the name of the element with the symbol 'Fe'?

Answer 27

Iron

Question 28

True or False: All elements can be found in nature.

Answer 28

False

Question 29

What is the role of neutrons in an atom?

Answer 29

They contribute to the mass of the atom and stabilize the nucleus.

Question 30

What is the formula to calculate the number of neutrons in an atom?

Answer 30

Mass number - Atomic number

Question 31

Which scientist proposed the planetary model of the atom?

Answer 31

Niels Bohr

Question 32

What is an electron cloud?

Answer 32

The region around the nucleus where electrons are likely to be found.

Question 33

Fill in the blank: The most reactive nonmetals are found in group ______.

Answer 33

17

Question 34

What is the main characteristic of transition metals?

Answer 34

They have variable oxidation states and form colored compounds.

Question 35

What are lanthanides and actinides?

Answer 35

They are two series of inner transition metals.

Question 36

What is an atomic orbital?

Answer 36

A region of space around the nucleus where an electron is likely to be found.

Question 37

True or False: The periodic table includes synthetic elements.

Answer 37

True

Question 38

What is the significance of valence electrons?

Answer 38

They determine an atom's chemical behavior and bonding.

Question 39

Which element has the highest electronegativity?

Answer 39

Fluorine

Question 40

Fill in the blank: The energy required to remove an electron from an atom is called ______.

Answer 40

Ionization energy

Question 41

What is the trend in atomic size as you move down a group in the periodic table?

Answer 41

Atomic size increases.

Question 42

What is the trend in electronegativity as you move across a period from left to right?

Answer 42

Electronegativity increases.

Question 43

What is the primary use of the periodic table in chemistry?

Answer 43

To predict the properties and behaviors of elements.

Question 44

What does the term 'periodicity' refer to in the periodic table?

Answer 44

The repeating patterns of chemical and physical properties of elements.