Vocab 1
An ____ is the smallest particle into which an element can be divided and still be the same element
atom
Electrons move within an area around the nucleus is called the _____ _______
electron cloud
The ____ ____ _______ of an atom is the weighted average of the masses of all the naturally occurring isotopes of that element
average atomic mass
Each horizontal row of elements on the periodic table is called a ______
period
A ______ ______ forms when atoms share one or more pairs of electrons
covalent bond
_____ is a small dense center that has a positive charge and is surrounded by moving electrons.
nucleus
The number of protons in the nucleus of an atom is the ___ _____ of that atom
atomic number
_______ are elements that are shiny and conduct heat and electricity well
metals
A ____ ______ is an interaction that holds atoms or ions together
A _________ is a group of atoms held together by chemical bonds
molecule
positively charged particles in nucleus are called _____
protons
The total number of protons and neutrons in an atom's nucleus is its _____ ________
mass number
_______ are poor conductors of heat and electricity
Nonmetals
Electrons found on the outermost energy level of an atom are called _______ _________
valence electrons
A ______ _____ forms between metal atoms when their outer most energy levels overlap.
metallic bond
The negatively charged particles later became known as _________
electrons
The arrangement of the elements is known as the ______ ________
periodic table
______ are the elements that have some properties of metals and some properties of nonmetals
Metalloids
An ___ is a particle with a positive or negative charge.
ion
_______ is the ability of metal to be hammered into sheets
malleability
The nucleus contains uncharged particles is called ______
neutrons
The ______ _______ is an abbreviation for the elements name.
chemical symbol
Each vertical column of elements on the periodic table is called a ______
group
ionic bond
The energy level furthest from the nucleus is called the _________ _____ ____
outermost energy level