| Term | Definition |
|---|
| Basic unit of matter | atom |
| Subatomic particles that make up atoms | protons, neutrons, electrons |
| The ___ is a negatively charged particle | electron |
| A pure substance that consists entirely of one type of atom | element |
| Atoms of same element that differ in the number of neutrons | isotopes |
| The sum of the protons and neutrons is called its _____ | mass number |
| Because they have the same number of electrons, all isotopes of an element have the same _____ | chemical properties |
| A substance formed by the chemical combination of 2 or more elements | compound |
| What are the main types of chemical bonds? | Ionic bonds and covalent bonds |
| What type of bond is formed when one or more electrons are transferred from one atom to another | ionic bond |
| What bond forms when electrons are shared between atoms | covalent bond |
| What is the smallest unit of most compounds? | molecule |
| What are intermolecular forces of attraction called? | van der Waals forces |
| Van der Waals forces are not as strong as ionic bonds or covalent bonds, but they can hold ______together | molecules |
| What is the structure of an atom? | Atoms have a nucleus made up of protons and neutrons. Electrons are in constant motion around the nucleus |
| Why do all isotopes of an element have the same chemical properties? | They have the same number of electrons. |
| How do isotopes of an element differ? | They have different numbers of neutrons. |
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