Unit 2 Test Flashcards
how many valence electrons does ALUMINUM have
3
how many electrons are in outermost shell of CALCIUM
2
In the modern periodic table, the elements are arranged in order of increasing?
atomic number
How many electrons are in the outermost shell of ARGON
8
How many electrons are in the outermost of NITROGEN
5
How many valence electrons does P have?
5
state of matter that has definite volume + shape?
solid
two subatomic particles that have the same mass?
protons + electrons
most elements are
metals
vertical columns are called what
groups
which substance is least dense
cork/ the closest one to the top
horizontal rows on the periodic table
periods
Lithium’s atomic number is 3/ atomic mass of 6.941, how many electrons does it have
3, look at atomic number
what state of matter has definite volume but no definite shape
liquid
density of 150cm3 with 700g of mass/round to 10
4.7 g/cm3
neutral charge and relatively the same as a proton
neutron
each element on the periodic table has its own what
atomic number
negatively charged electron cloud surrounding a positively charged describes what
atomic structure
which substance particle is farthest from the nucleus
electron
if an atom looked like a dartboard, where is the center at
bullseye
two simple substances combined chemically
compound
total number of neutrons in a neutral atom that has 19 electrons and a mass number of 39 ( subtract )
20
how many protons are in a neutral atom with an atomic number of 11 and an atomic mass of 23
11
Boron has an atomic mass of 10.811 and an atomic number of 5, how many neutrons/round
6
Which substance contains atoms that are electrically neutral
potassium
