picosecond

1 picogram = 10^-12 grams

nano

1 nanogram = 10^-9 g

micro

1 microgram = 10^-6 g

milli

1 milligram = 0.001 g

centi

1 centigram = 0.01 g

deci

1 decigram = 0.1 g

deka

1 deckagram = 10g

hecto

1 hectogram = 100g

mega

1 megagram = 10⁶ grams

giga

1 gigagram = 10⁹ grams

refers to how close to the true value a given measurement is

refers to how well a number of independent measurements agree with one another

NH₄⁺

Ammonium

HCO₃^-

Bicarbonate

CN^-

Cyanide

HSO₄^-

OH^-

NO₃^-

NO₂^-

ClO₄^-

MnO₄^-

CO₃^2-

CrO₄^2-

Cr₂O₇^2-

HPO₄^2-

SO₄^2-

SO₃^2-

S₂O₃^2-

PO₄^3-

Alpha particle

when a nucleus emits(decay) this particle, it loses 2 protons and so its atomic number decreases by 2.

when a nucleus emits (decay) this particle, its atomic mass decreases by 4.

Beta particle

when the nucleus emits this (decay)the atomic mass is unchanged

when the nucleus emits this (decay) the atomic number increases by 1.

the number of protons in the nucleus; defines the element

the number of protons plus the number of neutrons in an atom

atoms of the same element with different numbers of neutrons and therefore different masses