Unit 1.3 - Periodic Table Review

How are elements classified?

How many valence electrons do atoms of oxygen and sulfur have?

Why does the number of elements vary from period to period?

An atomic mass unit is _______

Mendeleev's decision to leave gaps in his periodic table was supported by the discovery of _____________

Copper is an example of _________

I need to go home and look over my notes

An element that is shiny and conducts electric current is likely to be a _________

I am prepared to take this assessment.

The most reactive metals are the ________

Which elements are as reactive as alkali metals?

Which elements are all gases at room temperature?

Which of the following is not part of the elements that make up the human body

Noble gases are the most reactive.

In a modern periodic table, elements are arranged in order of __________

Mendeleev arranged the elements in his periodic table in order of __________

Why don't the elements within an A group in the periodic table have identical properties?

Electrons in atoms occupy orbitals in energy levels.

Why was it difficult to discover noble gases?

How many periods does the periodic table have?

Flammability is a physical property.

Moving across a period from left to right...

How did Mendeleev Know where to leave the spaces in his table?

Elements that have the same number of valence electrons are _______

In general, what happens to the reactivity of elements in groups labeled A as atomic numbers increase across a period?