atoms/elements 1
Weighted Average mass of an element
Atomic Mass
Protons and neutrons are found where in an 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
Who created the periodic table
Dmitri Mendeleev
These have no definite shape but has a definite volume
Liquid
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
The amount of mass in a unit of volume is called what
Density
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
Particles are tightly packed together is called a?
Solid
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
These have no definite shape or definite volume
Gas
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
What is the formula for density
Mass/Volume
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
a change of materials into another, new materials with different properties
Chemical change