periodic table
what is element #1 on the periodid table
hydrogen
what are the three states of matter
liquid, gas, solid
how many subatomic particles are there?
3
what is the max amount of electrons in the first shell
2
how many grams are in a kilogram
1000
how many groups are there?
18
what is it called when solid turns to liquid
melting
what holds the protons and neutrons
the nucleus
true or false bhor models where invented in 1778
false
What is mL used to measure
liquid
where can the alkali metals be found
group 1
what is it called when liquid turns turns gas
evaporation
which 2 subatomic particles are typically the same number?
protons and electrons
who is the person who created bhor models
neils bhor
for something to float on water its density must be under this number
1g/cm3
how many periods are there
7
what state of matter takes the shape of its container
liquid
what is the charge of every subatomic particle
neutron= no charge
electron= negative
proton= postive
true or false elements with full valence shells can bond to other elements
false
how do you find density
mass divided by volume
what is the element of Ga's atomic mass, atomic number, and name
atomic mass 69.7(70) atomic number 31 and name gallium
what is it called when solid turns to gas
sublimination
The electrons in the outermost shell are called?
valence electrons
name 2 elements with 2 valence electrons
helium, all alkaline earth metals, magnesium, calcium, and barium
what is the volume of an object with the mass of 500g and the density of 5.7g/cm3
87.72cm3