Science 600 - Unit 5: Chemical Structure and Change Quiz 2: Periodic Table

118

"superheavy" element developed in the Berkeley National Lab

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

2

This is a square from the Periodic Table. Drag and drop the letters and numbers below into their appropriate places in the square. Beryllium is the fourth element on the periodic chart. It's atomic symbol is Be and it's weight is 9.012. On the square below, please drag and drop the symbol, number and weight on the correct spaces. In the left margin drag and drop the electrons found in each energy level or orbit.

2 2 4 Be 9.012

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

20 protons 20 electrons 20 neutrons

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

8

Mendeleev

A Russian chemist who developed the periodic table

chemical formula

CO 2

1N5C is a correctly written chemical formula. True/False

F

Base weight is a system of comparing atomic weights to carbon. True/False

F

The weights of all elements are always compared to oxygen. True/False

F

The chemical symbols of hydrogen, calcium and chlorine are: Hn, Cal, Cl H, C, Cl H, Ca, Cl H, C, Cn

H, Ca, Cl

______________ is the lightest chemical element.

Hydrogen

The chemical symbols for Magnesium, Uranium and Copper are: Mn, U, C Mg, U, Cu Mn, Ur, Co Mg, Ur, Co

Mg, U, Cu

The chemical symbols for Oxygen, Nitrogen, Potassium and Gold are: O, N, K, Au O, Ni, P, G O, N, P, Au Ox, Ni, K, G

O, N, K, Au

A molecule is the chemical combination of 2 or more atoms. True/False

T

Henry G.J. Moseley developed the current arrangement of elements in the periodic table by atomic number. True/False

T

Matter of the universe is made of building blocks known as atoms True/False

T

Protons, neutrons, and electrons are the 3 particles that make up an atom. True/False

T

Some chemical symbols represent the Latin names of the elements. True/False

T

The IUPAC officially assigns names to new elements that are discovered. True/False

T

The number one is never written in the formulas for chemical compounds True/False

T

Fe

a chemical symbol

Mass

amount of matter in a body or object

IUPAC

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

metals

elements to the left of the stair-steps on the periodic 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