chapter 2.3-2.5 Flashcards
(13 cards)
1
Q
can be used to solely determine the identity of an element
in a neutral atom it can also be the number of electrons
NEVER CHANGES
A
atomic number
2
Q
isotope
A
when you have two atoms with the same atomic number and different mass numbers
3
Q
groups or families
A
vertical rows
4
Q
periods
A
horizontal rows
5
Q
created the periodic table
A
dmitri medeleev
6
Q
elements along the boron stair case are
except aluminum
A
metalloids
7
Q
everything to the left of the boron stair case including aluminum are
A
metals
8
Q
upper right hand corner including hydrogen are
A
nonmetals
9
Q
molecule
A
an assembly of two or more atoms tightly bound together
10
Q
molecular form
A
2 or more atoms together
ex: oxygen O2
11
Q
ion
A
atom that has lost or gained an electron
12
Q
cation
A
positively charged ions
13
Q
anion
A
negative ion
