Chapter 1: Atoms, Elements, Compounds and Chemical Equations

________ are neutral- they have no charge overall (unlike ions)

It has a(n) ________ because of the protons.

________ can be shown in a kind of shorthand using symbol equations.

________ have virtually no mass.

Making ________ involves atoms giving away, taking or sharing electrons.

________ are different forms of the same element, which have the same number of protons but a different number of neutrons.

________ just show the symbols or formulas of the reactants and products.

________ are substances formed form two or more elements.

________ have a radius of about 10 nanometres (1x10- (9))

________ can have different numbers of protons, neutrons and electrons.

1 and +1

1 and 0

Very small and -1

charge, has two more electrons than protons

Carbon Dioxide + Water

Magnesium Oxide

2Mg0

Na2S04 + H20

move around the nucleus in electron shells and are negatively charges and tiny

middle of the atom and contains protons and neutrons and is positively charged

tells you how many protons there are

tells you the total number of protons and neutrons in the atom

Mass number - Atomic number

consist of atms with the same atomic number

atoms of each element shown by one or two letter symbols

sum of isotope abundance x mass number / 100

same amount of all elements

atoms combine with other atoms to form compounds