Atoms
What is the charge of neutrons?
neutral
What is a trick to know how many energy levels an atom has in its electron cloud?
Count the periods (horizontal rows)
Most atoms have a ________ charge. a. positive b. negative c. no
c. no charge
Most atoms have the same number of positive protons and negative electrons.
One property of metals is that they are able to bend without breaking. This property is called __________
"malleable" or "malleability"
On a periodic table there are ____ groups
18
What is the charge of a proton?
positive
True or False: Metals are good conductors of electricity, malleable, and ductile.
True
ductile- capable of being hammered out to thin wire
The sum of the protons and neutrons in an atom's nucleus is its _______________.
atomic mass
On a periodic table the atomic number determines how many _______ are in the nucleus of the atom.
protons
Dmitri Mendeleev
What is the name of the electrons on the outer energy level?
valence electrons
What are protons and neutrons made up of?
quarks
The greatest number of electrons an atom can hold in its second energy level is ______________
8
On a periodic table, the horizontal row of elements is called __________
periods or rows
Elements that have properties of both metals and nonmetals are known as ______________.
Metalloids
What‘s the name of the atomic model that focuses only on the valence/outer electrons?
Lewis Structure/electron dot diagram
What is the electric charge of an electron?
negative charge
True or False: Elements are grouped vertically by characteristics and horizontally by increasing protons.
True
How many electrons can the 1st energy level of an atom hold?
two electrons
On the Periodic table, most of the elements are metal, metalloids, liquids, gasses, or nonmetals?
metals
What determines the atomic number of an element?
protons in the nucleus of an atom
Elements in the same vertical column (group / family) have __________
similar characteristics
What subatomic particles make up the nucleus of an atom?
Neutrons and Protons
The Elements found in a PERIOD: a: have the same properties b. do not have similar properties c. belong to the same familiy. d. Increase by atomic number.
D. Increase by atomic number.
Elements that are good insulators, dull, and brittle are known as ______________
nonmetals