science midterm Flashcards
An elements atomic __________ is the average of all the Isotopes of that number
Mass
t or F
the word periodic means “ in regular, repeated pattern”
true
t or F
when you write the chemical symbol, remember to capitalize every letter
false
T or f
if you examine the periodic table, you can see that nonmetals make up most of the elements
false
t or f
Mendeleev’s original periodic table was sorted by Atomic Mass instead of Atomic Number
true
Metals are found of the ( left/ right) and nonmetals are found on the (left/ right)
left; right
what are horizontal rows known as
periods
The vertical columns in the periodic table are known as
groups
what are the subatomic particles of an atom
Neutron, electron, Protons
what is carbon
nonmetals
what is the friendiest metal
hydrogen
how many groups and families are on the periodic table
18
who are modern periodic tables organized
atomic number
t or f
transuranium elements are not stable and each of them decay radioactivlely into each other elements
true.
