What are some characteristics of atoms?

Atoms are the smallest fraction of an element that can exist, and still show the characteristics of the element. Atoms themselves are composed essentially of electrons (1 negative charge), protons (1 positive charge), and neutrons (no charge).

Explanation:

Here are a few characteristics of atoms. They are:

1. completely useless as paper weights (unless in large numbers),

2. hard to find when lost,

3. unreliable - they make everything up,  

4. essential in the manufacture of novelty moustaches,

5. conveniently portable in most forms,

6. very light - even several quintillion will hardly dent your carry on allowance.

Explanation:

hope this helped ^-^

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.