Chemistry Part 1 Test
What is a row on the periodic table called?
period
what is a column on the Periodic Table called
group
What is a valence electron?
outer shell electron
Where is the electron located and what charge does it have
outside of the nuclus with a negative charge
How many elements are there?
118
how many elements are there that occur naturally
92
What is an element?
A pure substance that is made up of only one kind of atom. It cannot be broken down into other substances by ordinary laboratory methods
What is an ion?
An atom with a positive or negative charge/ when an atom looses an electron, it becomes positively charged/ When an atom gains an electron, it becomes negatively charged/ The numbers of protons and electrons are not equal
What are isotopes?
Atoms of the same element that have different numbers of neutrons
Who created the periodic table?
Dmitri Mendeleev
what is the current atomic model called
Electron cloud model
what is atomic mass and why is it an average
It is the mass of the atom and it is an average because all of the isotopes equal that.
what category of elements is located between the metals and the non-metals on the Periodic Table and forms a stair-step
Metalloids
who came up with the atomic model that shows energy levels in shells around the nuclus
Niels Bohr
what are the stable and unreactive gases on the farthest right side of the Periodic Table called
Noble Gases
what category of elements is located on the right side of the Periodic Table
Noble Gases
how do you find the number of neutrons in an atom
Subtract the atomic mass by the atomic number.
Groups 3-12 on the Periodic Table are special metals called what
Transition Metals
what is the largest category of elements, located on the left side and into the middle of the Periodic Table
Transition Metals
what is a neutral atom
an atom with the same number of protons and electrons
Where is the neutron located and what charge does it have
in the nuclus with a neutral charge
Where is the proton located and what charge does it have
in the nuclus with a positive charge
when one atom gains an electron, it becomes what charge
negatively
What does an element's atomic number tell us
number of protons and electrons
when one atom gives away and electron, it becomes what charge
positively
3 subatomic particles of an atom
protons, neutrons, electrons
what is the main component that makes one element different from another element
the number of protons
