FUNDAMENTAL CONCEPTS OF CHEMISTRY
chemical formula, chemical equation, proton, neutron, element, electron, atomic nucleus,
molecule, cation, anion, chemical compound, chemical reaction, chemical bonds, ion,
molecule, atomic number
An
atom is
a collection of matter consisting of a positively
charged core (the
________________ ) which
contains ____________ and ____________ and which
maintains a number of electrons to
balance the positive charge in the nucleus. The atom is
also the smallest
portion into which an
____________ can be divided and still
retain its
properties,
made up of a dense, positively charged nucleus surrounded by a system of
____________.
The most basic chemical
substances are the chemical
elements. They are building blocks of all other substances. An
element is a class of atoms which have the same number of
protons in the nucleus.
This number is known as the
Достарыңызбен бөлісу: 
