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Chapter 2 Section 1
Biology vocab
| Term | Definition |
|---|---|
| Matter | Anything that has mass and takes up space |
| Mass | A measure of the amount of matter in an object; a fundamental property of an object that is not affected by the forces that act on the object, such as the gravitational force |
| Element | A substance that cannot be separated or broken down into simpler substances by chemical means; all atoms of an (___) have the same atomic number |
| Atom | The smallest unit of an element that maintains the chemical properties of that element |
| Nucleus | In physical science, an atom's central region, which is made up of protons and neutrons |
| Proton | A subatomic particle that has a positive charge and that is located in the nucleus of an atom; the number of (___)'s in the nucleus is the atomic number, which determines the identity of an element |
| Neutron | A nerve cell that is specialized to receive and conduct electrical impulses |
| Atomic Number | The number of protons in the nucleus of an atom; it is the same for all atoms of an element |
| Mass Number | The sum of the numbers of protons and neutrons in the nucleus of an atom |
| Electron | A subatomic particle that has a negative charge |
| Orbital | A region in an atom where there is a high probability of finding electrons |
| Isotope | An atom that has the same number of protons (or the same atomic number) as other atoms of the same element do but has a different number of neutrons (and thus a different atomic mass) |
| Compound | A substance made up of atoms of two or more different elements joined by chemical bonds |
| Chemical Bond | The attractive force that holds atoms or ions together |
| Covalent Bond | A bond formed when atoms share one or more pairs of electrons |
| Molecule | A group of atoms that are held together by chemical forces; a (___) is the smallest unit of matter that can exist by itself and retain all of a substance's chemical properties |
| Ion | An atom, radical, or molecule that has gained or lost one or more electrons and has a negative or positive charge |
| Ionic Bond | The attractive force between oppositely charged ions, which form when electrons are transferred from one atom to another |
Created by:
Sadrian18
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