Anything that takes space
|Who invented the periodic table?||
|How many elements are essential to life?||
|4 most abundant element on earth?||
Carbon, hydrogen, oxygen, and nitrogen
|Essential bulk elements? Other than the most abundant ones||
Phosphorus, sodium, magnesium, potassium, and calcium.
|Ion means what||
Is an atom or group of atoms that has gained or lost an electron. Therefor making it a negative or positive charge.
When a atom has an increased number of neutrons then the normal amount!
If you average mass of all isotopes
|When does a radioactive occur in an atom||
Many of the known isotopes are unstable and radioactive, which means they emit energy as rays or particles when they break down into more stable forms
A fundamental type of substance
|Lasting of radioactivity||
Fraction of a second to millions of years
A covalent bond forms when two atoms share electrons.
Is a measure of an Atoms ability to attract electrons