The Atom
Where are protons and neutrons located in an atom?
Nucleus
What is the element symbol for calcium?
Ca
What particle orbits the nucleus?
Electron
Are most elements in the periodic table metals or nonmetals?
Metals
What is Mr. Sheridan's first name?
Michael or Mike
Atomic number is the number of --- in the nucleus of an atom?
Protons
Mg is the symbol for what element?
Magnesium
Why is the electron not included in the weight of an atom?
It is extremely light
True
What is the term used to describe the outermost electrons in an atom?
Valence
Lithium's two numbers are 3 and 7. How many electrons does it have?
Three (3)
What is the last "naturally-occurring" element on planet Earth?
U = uranium
What is the charge of neutrons?
Neutral (Zero)
Name one type of chemical bond?
Ionic or Covalent
Why are the Group 8 elements very unreactive?
They have a FULL outer energy level (2 or 8 electrons) or They are chemically stable.
What is the maximum number of electrons the 1st energy level (orbital) can hold?
Two
Au is the element symbol for what element?
Gold
The mass of a proton is equal to the weight of what other subatomic particle?
Neutron
Ionic bonds occur between a --- and a ---
Metal, Nonmetal
Kr is the symbol for which element?
Krypton
How do you find the number of neutrons in an atom?
Subtract the atomic number from the mass number
The periodic table is arranged in order of increasing...
Atomic Number
What is the unit of mass used by scientists for weighing protons, neutrons, and electrons?
amu = atomic mass unit
How many electrons are shared in a covalent bond?
Two
How many times lighter are electrons compared to protons or neutrons?
2000 (1800)