The Atom & Periodic Table

Sodium has an atomic # of 11 and an atomic mass of 22, this is a happy atom.

The nucleus of the atom contains

What element is represented by He? 

An oxygen atom has an atomic mass of 16 and an atomic # of 8, how many neutrons are there?

An ancient man, __ taught people that things were made of grains that could not be divided.

This scientist was a Quaker, he explained that each element is made of small atoms.

The element K has an atomic # of 19 and atomic mass of 39, how many neutrons are there?

The atomic number represents the number of

The Russian scientist who invented the periodic table is _____________.

Helium has an atomic # of 2 and an atomic mass of 4, how many e- are in it's 1st energy level?

A carbon atom has an atomic # of 6 and an atomic mass of 12, what is it's proton #

The weight of an atom is measured in ________________ (units).

In 1911 _________________________ concluded that most of the atom was empty space.

In general, what happens to the atomic mass as you move across (l to r) in a period?

In 1932 this scientist, Chadwick discovered the _________________.

The periods in the period table are the

In a neutral atom, the proton # happens to equal the _________ #.

The element Oxygen has _____electrons in it's 2nd energy level _(atomic # 8, atomic mass 16)

There are __________________groups or families in a period table.

Our current atomic model shows a ___________charged cloud of _________.

The second letter in a chemical symbol is always __________________

There are _____________periods in a periodic table.

There are ____________natural atoms found in the world.

An atom's weight (mass) are not in grams, but are based on the relative weight of _________.

Hydrogen has an atomic # of 1 and an atomic mass of 1, how many electrons does it have?

The farthest away or most loosely held electrons are called__________.

Protons are _______________charged subatomic particles.