Atoms- Smallest Unit of Matter  Practice Problems

Any substance that cannot be decomposed into simpler substances by ordinary chemical processes is:

How does the number of protons in an atom's nucleus relate to its atomic number?

Why are trace elements important for microbes?

Why is a calcium ion noted as Ca⁺²?

What is the atomic number of an element?

Choose which statement is INCORRECT about the periodic table and its contents:

Which of the following are negatively charged particles?

All of the following significantly contribute to the atomic mass, except:

The element carbon has 6 protons and 6 electrons. How many valence electrons are present on its last orbital?

What molecule do cells use to store and release quick bursts of energy?

Which of the following reactions is a decomposition reaction?

Most of the nitrogen in the atmosphere is found in which of the following forms?

What is the primary source of phosphorus for plants?