Elements Flashcards

All 5 cards in this deck

What is an atom?

The smallest part of an element that can exist.

What is an element?

A substance made of only one type of atom — all its atoms have the same number of protons.

How is each element represented in a formula?

By its chemical symbol: one capital letter, sometimes with a second small letter.
e.g. magnesium is $Mg$

True or false? All the atoms of a particular element have the same number of protons.

True. Atoms of different elements have different numbers of protons.

True or false? A substance made of molecules containing two atoms of the same element, such as $O_2$, is a compound.

False. It is an element — a compound must contain atoms of two or more different elements.