Foundations of Chem Quest 3/31 Flashcards
Matter
Anything that has mass and takes up space
Atom
A small particle that is a building block of matter
Substance
Matter with a composition that is always the same
Element
A substance that consists of just one type of atom
Atomic number
Number of protons
Compound
A type of substance containing atoms of two or more different elements chemically bonded together
Period
The horizontal rows
Groups
The vertical rows
What subatomic particles are located in the nucleus of an atom?
Protons and neutrons
Valence shell
The outermost shell of an atom
What do groups on the periodic table indicate?
The number of valence electrons in an element
Groups 13-18 valence electrons
The second digit of the group number
Ex: Group 16 has 6 valence electrons
What do periods on the periodic table indicate?
The number of shells that exist around the nucleus an atom has
Lewis Dot Structure dots
Number of valence electrons
How to find number of neutrons
Atomic mass - atomic number