genral knowlage Flashcards
what is the charge of a proton
+1
what is the charge of a neutron
0
what is the charge of a electron
-1
why do electrons on the 7t sublevel have less electroastic attraction to the nucleus then electrons in the sub level
Electrons in the 7th sublevel are farther away from the nucleus compared to those in lower sublevels.
how to calculate number of neutrons
N = mass number - atomic number
how to calculate number of electrons
e- = atomic number - ionic charge
name the properties of metals
high melting points, high heat and electrical current and malleable
name the properties of non- metals
low melting points, do not conduct heat and electisity
what are metalloids
silver coloured, soft metals with low density. They easily react with water and halogens. Their reactivity increaces down the group.
name all the groups
Alkaline
alkaline earth metals
halogens
noble gases\
what is ionic bonding
atoms transfer valence electrons to eachother so that the element can have a full valence electron
ionic bonding happens between what kind of elements
metals and non metals
what are the properties of ionic bonding
hgih melting and boiling points,soild at room tempreture, soluable in water
what is covelent bonding
where 2 elements share electrons to form bonds
what kind of elements do colevent bonds happen between
metal and metal
what is an isotope
Atoms with the same number of protons but different numbers of neutrons
how can one infer the apporximate percentage abundance in isotope elements by just being given the atomic mass of both isotopes
The isotope with an atomic mass closer to the average atomic mass will have a higher abundance.
what does abundance add up to
100
what is the ram formula
Relative atomic mass =
(%1 times Atomic mass) / 100 +(%2 times Atomic mass) / 100 …………
