the smallest particle is called
a quark
subatomic particle with a negative charge
electron
subatomic particle with a positive charge
proton
If an atom has a mass number of 35, will the protons and neutrons be equal?
no
change in mass is called
isotope
subatomic particles
protons, neutrons, electrons
change in electrons
ion
a tiny piece of matter that cannot be divided
atom
what is the symbol for the element Lead
Pb
how many metalloids are on the periodic table
7
how many valence electrons does an alkaline earth metal have
in a neutral atom, the number of protons equals the number of
electrons
the name for the rows in the periodic table
periods
how many nonmetals are on the periodic table
18
the name for columns in the periodic table
groups
what makes an element distinct
protons
at room temperature, none of the metals are
gases
period 6
cloud model maximum on innermost shell
two
how many elements are on the periodic table
118
element symbol with the highest mass
Og
atoms of the most reactive elements are in which groups?
group 1 and group 7
the locations of electrons in atoms is shown on what model
cloud model
Mendeleev left spaces for elements that were
unknown and similar to those already discovered
how does reactivity change in group 1 (alkali metals)
more reactive as it goes down