periodic table
Which element is a "One-of-a-kind"?
Hydrogen
What are 2 examples of physical properties?
Color, Texture
name CaCL2
Calcium chloride
Define positive ion
An electronically charged atom
What are the vertical columns called?
Groups
Evidence of a chemical change
Light, Heat, and smoke
name K2O
potassium oxide
How many protons does aluminum have?
13 Protons
When Mendeleev created the first periodic table the elements were put in a specific order based on what?
Increasing Atomic Mass
What is Pure substance?
Contains only one type of matter
name MgO
magnesium oxide
The atomic number is equal to the number of
Protons in the nucleus
What METAL family is the most reactive?
Alkali Metals
Name one physical property that can be measured
Mass
name BeBr2
beryllium bromide
How do you find the mass number of an element?
Add the number of proton and neutrons
The elements found in group 3-12 that form or make compounds with distinctive colors, are called the
Transition Metals
The 2 most important properties of matter are
Taking up space and having mass
name Ca3N2
calcium nitride
Which atomic particle travels on the energy levels?
the electron