1. An atom is the smallest component of an element having the chemical properities of the element. In the center is a nucleus which is surrounded by a cloud of negatively charged electrons.
2. The three particles that make up an atom are: 1. protons- which have a postivie charge 2. nuetrons- which have no charge and 3. electron- which have a negative charge.
3. Atoms differ in size but when looking at the periodic table, atom size tends to increase when moving down columns, but decrease when moving across rows (left to right).
4. Atoms lack a well-defined outer boundary, so their dimensions are usually described in terms of an atomic radius- which is a measure of the distance out to which the electron cloud extends from the nucleus. This assumes the atom to exhibit a spherical shape, which is only obeyed for atoms in vacuum or free space. Atomic radii may be derived from the distances between two nuclei when the two atoms are joined in a chemical bond. The radius varies with the location of an atom on the atomic chart, the type of chemical bond, the number of neighboring atoms and a quantum mechanical property known as spin. Therefore, the shape is either spherical or unknown.
Particles inside the atom-- there is a nuclus and inside that is protons and neutrons. Outside of the nucleus are electrons.
5. Charactersistics of electrons-
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