Chemistry Concepts Flashcards

Front

Which element has five valence electrons?

Back

P

Front

How many energy levels does boron have?

Back

3

Front

Elements in the noble gas family are considered stable because their outer energy levels are ____

Back

full

Front

Elements in the same column on the periodic table have the same number of ________

Back

valence electrons

Front

How many protons does carbon have?

Back

6

Front

The atomic number tells the number of __ in the nucleus of the atom.

Back

protons

Front

The atomic number of an element indicates how many of which particle(s) are present in the atom?

Back

protons only

Front

Which particles contribute appreciably to the mass of an atom?

Back

protons and neutrons

Front

Which scientist had a postulate that stated that all atoms of a given element are identical?

Back

Dalton

Front

Who was the first to state that atoms are indivisible?

Back

Democritus