Of the three subatomic particles, which two are of similar size
neutrons and protons
100
The atomic number of an element represents the element's number of _____
protons
100
The family of salt formers
Halogens
100
This bonding type involves sharing of electrons.
covalent
100
Isotopes of an element have the same number of _____ and ____ but different numbers of _____.
protons, electrons, neutrons
200
What are the symbols and charges for all three subatomic particles
p+, e-, n0
200
In the modern periodic table, elements are arranged according to increasing:
a) date of discovery
b) electrical conductivity
c) reactivity with oxygen
d) atomic number
mitochondria
200
Examples would be sulfur, nitrogen, oxygen
Non metals
200
How many valence electrons are there in the outer shell of Potassium (K).
one
200
The periodic table is organized by columns called _____ and horizontal rows called ______.
groups, periods
300
Thomson's mental image of what the atom looked like:
a) a marble with raisins
b) a solid marble
c) a balloon full of air
d) a cork
a
300
When Mendeleev created the periodic table he found that elements with similar ______ fell into the same groups (families)
properties
300
Elements that have properties of both metals and nonmetals
metalloids
300
A substance that contains two or more elements CHEMICALLY bonded is called a _____
compound
300
The symbol for silicon is ______ and it has an atomic mass of ____ and an atomic number of ______ which means it has _____ neutrons.
Si, 28, 14, 14
400
Dalton's model of the atom could best be describes as:
a) a marble with raisins
b) a solid marble
c) a balloon full of air
d) a cork
b
400
Explain why the atomic masses of the elements are not whole numbers
isotopes
400
Name of Group 1, are metals and good conductors of electricity
alkali metals
400
A charged element that has gained or lost an electron is called a(n) _____
ion
400
A substance that is made up of elements and/or compounds that can easily be separated is called a _____.
mixture
500
Rutherford's experiments showed that atoms are:
a) mostly empty
b) have a negative core
c) are dense
d) are comprised of electrons, neutrons and protons
a
500
All elements on the periodic table can be split up into three main groups. What are they?
Metals, Nonmetals, Metalloids
500
Kypton and Xenon are in this group (family)
noble gases
500
A molecule in which electrons are shared unequally
polar
500
A combination of symbols that represents a compound (NaCl for example)