Chemistry Flashcards
What is the diameter of a typical atom?
100 picometers
(10 million atoms lined up in a row to make 1 millimeter)
Atoms are almost made up entirely of…
Empty space
What is an atom?
The smallest part of a chemical element that can exist.
What does an ion atom look like?
The atom has a different number of electrons than it’s number of protons.
What does an isotope atom look like?
The atom has a different number of neutrons to it’s standard element form.
What does the electron arrangement of the outer shell tell you about the atom? Give examples.
It tells you about the properties of the atom. For example, a bond between two atoms is formed when a pair of electrons is shared - Carbon has four electrons in it’s valence shell thus can form four bonds.
Why do atoms want a full valence shell and how do they get it?
It is a more stable arrangement. For an atom to have a full valence shell they must loose or gain electrons. If an atom loses an electron it becomes positive and if it gains one it becomes negatively charged.
What is a positive and negative ion called?
Positive ion is a Cation.
Negative ion is an Anion.
What does the atomic number determine in an atom?
It determines the number of protons in the atom and is sometimes denoted as ‘Z’.
How to you find the relative atomic mass?
Number of protons + number of neutrons.
The Russian chemistry professor….. created the first….. in the year…..
The Russian chemistry professor, Dmitri Mendaleev created the first modern periodic table, in the year 1869.
