DISTRICT TEST 2/7 Flashcards
study (31 cards)
Determines by period (row) number
Energy levels
Determines the proton number
atomic number
Equals protons + neutrons
Mass Number
Electron Capacity
1st level: 2, 2nd level: 8, 3rd level: 8 electrons
Located on the left side of a chemical equation
reactants
Located on the right side of a chemical equation
products
Heat is on the reactant side
Endothermic Reaction
Heat is on the product side
Exothermic Reaction
Ions
Elements that have lost (positive) or gained (negative) electrons
Isotopes
Same element with different mass numbers
Chemical Bonding
Elements bond to become stable by obtaining 8 valence electrons
Proton
A subatomic particle with a positive charge found in the nucleus.
Mass
The amount of matter in an object.
Volume
The amount of space occupied by an object.
Density
The amount of mass in a certain volume.
Matter
Anything that has mass and takes up space.
The most massive part of the atom, containing protons and neutrons.
Nucleus
Ion
An element that carries an electric charge due to the loss or gain of electrons.
Lost or Gained
The process undergone by a positively charged ion in acquiring electrons.
Valence Electrons
Electrons in the outermost energy level of an atom, involved in bonding.
Isotope
An element with the same number of protons but different mass numbers.
Groups or Families
The vertical columns on a periodic table.
The sum of protons and neutrons in the nucleus of an atom.
Mass Number
Energy Levels
Determines by the period (row) number on the periodic table.
