CHEMICAL STRUCTURE AND CHANGE QUIZ 2

118

"superheavy" element developed in the Berkeley National Lab

CHEMICAL FORMULA

CO2

20 PROTONS 20 ELECTRONS 20 NEUTRONS

Calcium has an atomic number of 20 and an atomic mass (weight) of 40. Therefore, we know that calcium has:

ATOMS

Matter of the universe is made of building blocks known as ________________

2

Since helium has an atomic number of 2 and an atomic weight of 4, we know it must contain ______ neutrons

LATIN

Some chemicals symbols represent the ________________ names of the elements

IUPAC

The ________________ officially assigns names to new elements that are discovered

8

The atomic number of oxygen is 8. The atomic mass of oxygen is 16. How many neutrons does oxygen have?

H, C, Cl

The chemical symbol of hydrogen, calcium and chlorine:

Mg, U, Cu

The chemical symbols for Magnesium, Uranium and Copper:

O, N, K, Au

The chemical symbols for Oxygen, Nitrogen, Potassium and Gold are:

CHEMICAL COMPOUNDS

The number one is never written in the formulas for __________________________________

HYDROGEN

__________________ is the lightest chemical element

HENRY G.J. MOSELEY

_____________________________ developed the current arrangement of elements in the periodic table by atomic number

Fe

a chemcal symbol

MASS

amount of matter in a body or object

IUPAC

authority which credits the discoery of elements and assigns names to them

METALS

elements to the left of the stair-steps on the period table

RADIOACTIVITY

giving off or radiating of energy by atoms of unstable elements

RARE EARTH ELEMENTS

last 2 horizontal rows on the periodic table

WEIGHT

measurement of the pull of gravity

MOLECULE

A ___________________ is the chemical combination of 2 or more atoms

ATOM

Protons, neutrons and electrons are the 3 particles that make up an _________

MENDELEEV

Russian chemist who developed the periodic table