Periodic Table
Atomic number ____________ from left to right
increases
When an atom loses or gains an electron, it is called an ________.
ion
The Law of Conservation of Mass states that matter cannot be _________________ or _______________.
created or destroyed
Reactions that absorb heat are called _________________
The natural process that occurs in the sun and stars is _____________.
nuclear fusion
Group One (except Hydrogen), the most reactive metals, are called ________________
alkali metals
When a metal and a nonmetal transfer electrons, it is called a ____________ bond.
The small number to the bottom right of an element are called ________________
subscript
Reactions that release heat are called _______________
exothermic
The process that is used in nuclear power plants is called _________________.
Group 18, the least reactive elements, are called ____________ __________________.
noble gases
When nonmetals share electrons, it is called a ______________ bond.
covalent
The elements before the arrow are called _____________.
A campfire is an example of an _______________ reaction.
exothermic
One major disadvantage of nuclear power is ______________.
risk of explosion, radiation
Elements to the right of the zig-zag staircase are all called ___________________.
Elements that have ______ valence electrons are stable.
8
The elements after the arrow are called _____________.
products
Baking cookies is an example of an _______________ reaction.
endothermic
One major advantage of nuclear power is ______________.
efficient, no air pollution
Elements on the zig-zag staircase are called ______________.
metalloids
If a sodium atom loses an electron to chlorine, the sodium becomes +1 charge. What is the charge of the chlorine?
-1
H2 + O2 -> H2O
Balance the equation.
2H2 + O2 -> 2H2O
Chemical bonds occur between ____________ electrons.
valence
When an atom splits into two new atoms, it is called _____________________.
nuclear fission