atoms/elements 1
Weighted Average mass of an element
Atomic Mass
positively charged central part of the atom
nucleus
elements that have characteristics of both metals and nonmetals
metalloids
An element is made up of only one kind of
a. isotope
b. atom
c. plastic
b. atom
The three main subatomic particles that make up an atom are
a. neutrons protons and molecules
b. neutrons protons and ions
c. neutrons protons and electrons
c. neutrons protons and electrons
an elements _________ can be predicted from its location on the periodic table
properties
A sample of matter that has the same composition and properties throughout
Substance
positively charged particle in the nucleus
proton
elements that are usually dull in appearance and poor conductors of electricity and heat
nonmetals
On the periodic table, metalloids are found where?
A. On the left side
B. On the right side
C. between the metals and nonmetals
c. Between the metals and nonmetals
Elements in a vertical column of the periodic table have similar properties and are al members of the same ______ of elements
a. phase
b. atom
c. group
C. group
An element with an atomic number of 10 is located to the _________ of an element with an atomic number of 9
right
States that matter is neither created nor destroyed only changed in form
Law of conservation of matter
matter made up of only one kind of atom
element
former when two or more substances come together but don't combine to form a new substance
mixtures
Many __________ can conduct heat and electricity but they are not the best conductors
a. metals
b. metalloids
c. nonmetals
b. metalloids
The number of protons in an atom is known as its atomic
a. number
b. mass
c. bond
a. number
A horizontal row of elements in the periodic table
period
negatively charged subatomic particle
electron
uncharged particle in the nucleus of an atom
neutron
a small particle that makes up most types of matter on earth
atom
The _____________ are malleable, have luster, and are good conductors
a. metals
b. nonmetals
c. metalloids
A. metals
The smallest particle and element can be divided into is the
a. electron
b. neutron
c. atom
c. atom
Elements in the same vertical column of the periodic table are groups. they are also Called what?
family
tells you the number of protons in the nucleus of each atom of an element
atomic number
atoms of the same element that have different numbers of neutrons
isotopes
The sum of the atoms protons and neutrons
mass number
A mixture is heterogeneous if
a. it is made of two compounds
b. one of its parts is water
c. you can see its individual parts
c. you can see its individual parts
an elements mass number tells you this
The number of protons and neutrons in the nucleus
True or False: On the periodic table, elements in the same column have similar properties
True