Is the building block of the radiographer’s understanding of the interaction between ionizing radiation and matter.

Today, 118 substances or elements have been identified. How many are naturally occurring and how many are artificial?

Answer explanation

92 are naturally occurring and 26 are artificially produced.

smallest particle of matter that has all the properties of an element.

CENTURIES OF DISCOVERY

_________- all matter was composed of four substances: earth, water, air and fire; all matter could be described as combinations of these four basic substances in various proportions, modified by four basic essences: wet, dry, hot, and cold.

ENUMERATION

4 Basic Essences

Atom in Greek, means "_________” [a (not) + temon (cut)] to describe the smallest part of the four substances of matter.

All matter was composed of four substances

In this type of atom, elements could be classified according to integral values of atomic mass.

HIS WORK LED TO THE CREATION OF THE FIRST PERIODIC TABLE OF THE ELEMENTS.

What are subatomic particles?