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Copy of Practice Quiz - Unit 1 - Intro to Atoms (5/28/2026)

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50 questions

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Question 50

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What are atoms?

A) The smallest unit of chemical compounds

B) The basic building blocks of matter

C) Large molecules that make up cells

D) The components of protons and neutrons

Which subatomic particle has a positive charge?

A) Neutron

B) Proton

C) Electron

D) Isotope

Where are electrons located in an atom?

A) Inside the nucleus

B) In a cloud around the nucleus

C) In the nucleus with protons

D) In fixed orbits only

What does the atomic number (Z) represent?

A) The total mass of the atom

B) The number of neutrons in the nucleus

C) The number of protons in the nucleus

D) The number of electrons in the atom

How is atomic mass (A) calculated?

A) Protons + Electrons

B) Protons + Neutrons

C) Neutrons - Protons

D) Electrons + Neutrons

What does a neutral atom indicate?

A) More neutrons than protons

B) Equal number of protons and electrons

C) More electrons than protons

D) A charged ion

What is an anion?

A) A positively charged ion

B) A neutral atom

C) A negatively charged ion

D) A molecule with no charge

What is a cation?

A) An atom with equal protons and electrons

B) A negatively charged ion

C) A positively charged ion

D) An atom with no charge

What is found at the top of an element's box on the periodic table?

A) Element Name

B) Atomic Mass

C) Atomic Number

D) Symbol

Which of the following is a correct representation of an element’s symbol?

A) oo for Oxygen

B) O for oxygen

C) o for Oxygen

D) O2 for oxygen

What does the atomic mass represent?

A) The number of protons only

B) The average mass of an atom's isotopes

C) The number of electrons only

D) The mass of the nucleus only

In the periodic table, what does a row (period) indicate?

A) The atomic mass of the element

B) The number of protons

C) The energy levels of electrons

D) The chemical properties of the elements

What is the group (family) in the periodic table?

A) Horizontal rows of elements

B) Vertical columns of elements

C) The mass of isotopes

D) The atomic charge of elements

What is the atomic number of Sodium (Na)?

A) 11

B) 23

C) 12

D) 10

How do you calculate the atomic charge of an ion?

A) Protons - Neutrons

B) Neutrons - Electrons

C) Protons - Electrons

D) Electrons - Neutrons

Why is the atomic mass of Chlorine (Cl) not a whole number?

A) It has only one isotope

B) It is an average of all isotopes

C) It represents the number of electrons

D) It is a calculation error

How did scientists develop models of the atom before 1981?

A) By directly observing atoms

B) Through theoretical calculations

C) Based on experimental evidence

D) By using advanced technology

What is the main purpose of a scientific model?

A) To entertain scientists

B) To visualize and explain phenomena

C) To replace experimental data

D) To predict future discoveries

What is the typical radius of an atom?

A) 1 meter

B) 1 nanometer

C) 1 picometer

D) 1 millimeter

How many atoms could fit in a dot at the end of a sentence?

A) Thousands

B) Millions

C) Trillions

D) Billions

Which particles are found in the nucleus of an atom?

A) Electrons only

B) Protons and electrons

C) Protons and neutrons

D) Neutrons only

What is the charge of a neutron?

A) Positive

B) Negative

C) Neutral

D) Variable

What keeps electrons in constant motion around the nucleus?

A) Gravitational force

B) Electromagnetic force

C) Nuclear force

D) Friction

What is the nucleus of an atom primarily composed of?

A) Electrons and neutrons

B) Protons and neutrons

C) Electrons only

D) Protons only

What is the electric charge of protons?

A) -1

B) 0

C) +1

D) Variable

What is the nucleus's size relative to the atom?

A) It is larger than the atom

B) It is about the same size as the atom

C) It is a fraction of the size of the atom

D) It is immeasurable

What prevents the nucleus from disintegrating?

A) Electromagnetic force

B) Strong nuclear force

C) Gravitational force

D) Weak nuclear force

What is the mass of an electron compared to a proton?

A) Heavier

B) Equal

C) Lighter

D) Variable

What charge do electrons carry?

A) +1

B) 0

C) -1

D) +2

What does each element's symbol represent?

A) The mass number

B) The atomic number

C) A unique element

D) The number of neutrons

What does the atomic number determine?

A) The mass of the atom

B) The chemical reactivity

C) The identity of the element

D) The number of isotopes

How is the mass number calculated?

A) Protons + Electrons

B) Protons - Neutrons

C) Protons + Neutrons

D) Neutrons - Electrons

What are isotopes?

A) Atoms with different numbers of protons

B) Atoms with different numbers of electrons

C) Atoms with the same number of protons but different neutrons

D) Atoms with equal numbers of protons and neutrons

Which of the following symbols represents potassium?

A) P

B) K

C) Po

D) Pt

What does the mass number indicate?

A) Total number of protons only

B) Total number of neutrons only

C) Total number of protons and neutrons

D) Total number of electrons only

What is the charge of a neutral atom?

A) Positive

B) Negative

C) Neutral (zero)

D) Variable

How do you round atomic mass to the nearest integer?

A) Always round up

B) Round based on the decimal

C) Ignore the decimal

D) Use a calculator

If an atom has an atomic number of 12, how many protons does it have?

A) 12

B) 24

C) 6

D) 0

What does the atomic charge indicate?

A) The mass of the atom

B) The imbalance of protons and electrons

C) The number of neutrons

D) The energy levels of electrons

What is the primary role of neutrons in the nucleus?

A) To provide a positive charge

B) To balance the charge of protons

C) To hold protons together

D) To determine chemical properties

What type of force keeps protons and neutrons together in the nucleus?

A) Weak nuclear force

B) Gravitational force

C) Electromagnetic force

D) Strong nuclear force

What is the main function of electrons in an atom?

A) To determine the mass

B) To define the element

C) To participate in chemical bonding

D) To form the nucleus

How many electrons does a neutral atom with an atomic number of 8 have?

A) 8

B) 16

C) 0

D) 4

What is the relationship between protons and atomic number?

A) Atomic number = Protons + Neutrons

B) Atomic number = Protons

C) Atomic number = Electrons

D) Atomic number = Neutrons

What is the purpose of the periodic table?

A) To list all known compounds

B) To organize elements based on properties

C) To provide historical context

D) To show atomic sizes

How is the atomic mass of an element typically displayed?

A) As a whole number

B) As a decimal number

C) In grams

D) In kilograms

What happens to the atomic charge when electrons are added to a neutral atom?

A) It becomes positive

B) It becomes neutral

C) It becomes negative

D) It becomes zero

Which particle is responsible for the chemical properties of an atom?

A) Protons

B) Neutrons

C) Electrons

D) Isotopes

What is the electron configuration of a neutral oxygen atom?

A) 2

B) 6

C) 8

D) 4

Which of the following statements is true about isotopes?

A) They have the same number of protons but different electrons.

B) They have different mass numbers but the same atomic number.

C) They are always radioactive.

D) They have different atomic numbers.