Basic Chemistry Quiz

Which part of the atom contains protons and neutrons?

• Electron cloud

• Nucleus

• Outer shell

• Valence shell

How is the atomic weight of an element determined?

• By the number of protons only

• By the number of neutrons only

• By the calculated mean of the atomic weights of its isotopes

• By the number of electrons only

Who devised the periodic table in 1869?

• Albert Einstein

• Dmitri Mendeleev

• Isaac Newton

• Marie Curie

What does the atomic number of an element represent?

• The number of electrons in an atom

• The number of protons in an atom

• The number of neutrons in an atom

• The atomic mass of an atom

What is the main reason group 18 elements are considered inert or noble gases?

• They have a full outer electron shell.

• They have an empty outer electron shell.

• They have more protons than electrons.

• They can easily gain electrons.

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What is the charge of ions formed by Group 17 elements when they gain an electron?

• Positively charged

• Negatively charged

• Neutral

• Double charged

In a chemical equation, what do the substances on the left side represent?

• Products

• Reactants

• Compounds

• Elements

What is the definition of an element?

• A substance that cannot be broken down into substances with different properties

• A substance that can be broken down into substances with different properties

• A substance that is composed of one type of atom

• A substance that is composed of protons, neutrons, and electrons

What is the atomic number of an element?

• The number of protons

• The number of neutrons

• The number of electrons

• The number of protons and neutrons

What is the mass number of an element?

• The number of protons

• The number of neutrons

• The number of electrons

• The number of protons and neutrons