Elements Compounds and Mixtures Flashcards
(24 cards)
Name the parts of an atom
proton
neutron
electron
what is the charge of an electron
negative charge
what is the relative mass of an electron
0
what is the relative mass of a neutron
1
what is the relative mass of a proton
1
what is the charge of a proton
postitve charge
what is the charge of a neutron
neutral charge
where are the protons and neutrons found in an atom
nucleus
where are the electrons found in an atom
electron shells
what is the mass number of an element
number of protons + number of neutrons
what is the atomic number of an element
number of protons
how do you find the number of neutrons of lithium
7-3=4
mass number - proton number
how do you know that an atom is neutral in charge
number of protons equals number of electrons
descire how many electrons arwe found in the first four shells of a atom
2 in the first
8 in the second
8 in the third
2 in the fourth
an element is
a substance made of one type of atom
a compound is
a type of substance that ius chemically with two oor more different types of atoms
a molecule is
a group of atoms chemically bonded
a pure substance is
matter is pure when all the substances within it are the same
example- Boxes X, Y and Z are pure substances
a mixture is
2 or more different substances that are not chemically bonded
Example: Box D is a mixture- other boxes are pure substances
Which box/es contains a pure element?
Box C and D only
Which box/es contains a mixture of elements?
Box B only
Which box/es contain molecules?
Box A, B and D only
Which box/es represents a mixture?
Box B only
Which box represents a pure substance?
Box A, C and D
