Element
What element has an atomic mass of 69.723
What is Gallium
The majority of the periodic table is... (classification)
metals
Subatomic particle(s) found in the nucleus of an atom.
Protons and neutrons
Group 7 is called...
Halogens
True or False: The periodic table contains only elements found in nature.
False
This number stands for the number of protons.
atomic number (Z)
What does the staircase on the periodic table signify?
Separates metals and nonmetals. AND/OR Is made up of metalloids
Atomic mass is equal to
protons + neutrons
They are solid, soft, and shiny metals with low melting points. Highly reactive.
Alkali metals
How many periods are on the periodic table?
7
The column going up and down of the periodic table
the group
These types of elements are malleable and ductile (classification)
metals
What does the atomic number determine?
protons
Ne, Kr, Xe belong to
Noble gases
Most of the elements were discovered before the common era.
False
What element is found on Group 4 period 5?
Zirconium
This element has 8 protons and needed for life.
What is oxygen?
Isotopes have a different number of
neutrons
This group is very similar to group 1 but less reactive.
Alkali Earth Metals
How many elements are there in the PT?
118
These elements do not conduct heat or electricity.
nonmetals
He is regarded as the scientist that finally figured out how order the elements
Dmitri Mendeleyev
What is the atomic mass
The weighted average mass of all the naturally occurring isotopes of an element. OR The Neutrons + Protons
They are 38 elements. Ductile and malleable and conduct electricity and heat.
Transition metals
Group number and period number that Gallium is in.
What is group 3, period 4?