atoms and periodic table Flashcards
what is covalent bonding
the sharing of electrons between non-metals to form molecules.this can be between the same element of different elements.
why is every atom neutral
the number of positive protons equaks the number of negative electrons. nuetrons are neutral.
what is a compound
two or nore elements which are chemicaly bonded
number of protons and neutrons
atomic mass
a subatomic particle that has a positive charge and that is found in the the nucleus of an atom
proton
a subatomic particle that has a negative charge not in the nuecleus
electron
lithum
3 protons
4 nuetrons
9 electrons
what is ionic bonding
where non- metals and metals gain or lose electrons forming negative or positive ions which are oppositely charged, holding the ions in strong bonds.
what is an elements
a substance made up of only one type of atom
what is the definition of an atom
the smallest part of an element that an still be recognized as that element
a subatomic particle that has no charge and that is found in the nucleus of an atom
nuetron
what is limestone
a rock made mainly of calcuim carbonate
why must all chemical reactions be balanced
no matter can be created or destroyed so the number of atoms on each side of the equation must be equal
