LOCOM, Elements, and The Periodic Table Practice

Front

What is the chemical equation for the formation of water from hydrogen and oxygen?

Back

2H₂ + O₂ → 2H₂O

Front

What do the different structures of elements indicate about their atomic composition?

Back

Their atoms have different numbers of protons, neutrons, and electrons.

Front

What does an uncharged atom with seven electrons indicate about its nucleus?

Back

The nucleus must contain seven protons.

Front

What is a common property of Alkali Earth Metals (Group 1)?

Back

Reactivity.

Front

What is the atomic number of Magnesium?

Back

12.

Front

What is the definition of an element?

Back

A substance that cannot be broken down into simpler substances by chemical means.

Front

What is the significance of the atomic number of an element?

Back

It represents the number of protons in the nucleus of an atom.

Front

What is a molecule?

Back

A group of two or more atoms bonded together.

Front

What is the difference between a compound and a mixture?

Back

A compound is a substance formed when two or more elements chemically bond, while a mixture is a combination of two or more substances that retain their individual properties.

Front

What are valence electrons?

Back

Electrons in the outermost shell of an atom that determine its chemical properties.