The Atom
What part of the atom has a negative charge?
Electron.
What is the periodic table?
The arrangement of elements.
What is a chemical reaction?
The process in which atoms are rearranged to produce new substances.
What is a chemical equation?
An expression that uses symbols to show the relationship between the starting substances and the substances that are produced by a chemical reaction.
What is atom?
The smallest particle into which an element can be divided and still be the smallest.
What is the atomic number?
The number of protons.
Who arranged elements as a table and made the first periodic table?
Dmitry Mendeleev.
What does the law of conservation of mass state?
Matter is neither created nor destroyed.
What is the chemical formula?
It uses chemical symbols and numbers to represent a given substance.
What are elements?
Basic substances of matter.
What are parts of an atom?
Protons, neutrons, and electrons.
What is the verticle column of the periodic table called?
Group.
What happens to energy during a chemical reaction?
Energy can either be released or absorbed.
What are reactants?
Substances that participate in a chemical reaction.
What is period?
A row of elements on the periodic table.
What is the atomic mass?
The number of protons and neutrons.
How are elements arranged in the periodic table?
By increasing the atomic number.
Which type of reaction absorbs energy?
Endothermic reaction.
What are products?
Substances formed in a reaction.
What are metals?
Elements that are shiny and conduct heat and electricity well.