Matter that has the same composition and properties
What is a substance
100
A combination of two or more pure substances that are not chemically combined, substances held together by physical forces, No chemical change takes place, Each item retains its properties, and They can be separated physically
What is a mixture
100
The have shiny luster and are solid at room temperature except for mercury
What is metals
200
When an atom gains or loses an electron it is known as
What is an ion
200
outer ring of electrons that has strong energy
What is valence electrons
200
substance made up of atoms of two or more chemically joined elements.
What is a compound
200
substances that are not distributed evenly throughout the mixture; you can see the different parts
What is heterogeneous mixture
200
Most are gases, except Br
Brittle in solid phase
What is nonmetals
300
(atoms with different numbers of protons and neutrons) can become unstable and are called radioactive
What is an isotope
300
particle of an atom that has a negative charge.
What is electron
300
What does a compound formula tell a scientist
What is The formula tells you which elements make up a compound as well as how many atoms of each element are present.
300
(ALSO KNOWN AS SOLUTIONS) - substances that are evenly distributed throughout the mixture; you cannot see the different parts
What is homogenous
300
What are the four states of matter
What is plasma, gas, liquids, and solids
400
What are the three particles of an atom?
What is protons, neutrons, and electrons
400
area around an atom’s nucleus where electrons are found.
What is an electron cloud
400
tell how many atoms there are this element Sulfuric Acid H2SO4
What is 2 Hydrogen and 4 Oxygen
400
a mixture of two or more substances is known as a
What is solution
400
CHARACTERISTICS OF BOTH METALS & NONMETALS
What is metalloids
500
Name the 4 atomic forces
What is gravitational, strong, weak, and electromagnetic forces
500
What is the number of Neutrons in Beryllium, which has atomic mass of 9.0 and atomic number 4
What is 5
500
pure substance that cannot be separated into simpler substances by physical or chemical means.