This number tells you the number of protons in an atom's nucleus.
What is atomic number?
Has a chemical symbol of Cl.
What is chlorine?
The chemical symbol for Hydrogen in?
What is H?
Most elements are classified as ______ and appear to be to the left of the zig-zag on the periodic table.
What are metals?
Has 20 protons.
What is Calcium?
Elements that have characteristics of both metals and nonmetals.
What is metalloids?
Elements on the right side of the periodic table and are gasses at room temperature.
What are nonmetals?
___ elements account for almost all matter that makes up our planet.
a. two
b. five
c. nine
What is C
9 elements, oxygen, silicon, aluminum, calcium, sodium, potassium, magnesium, nickel, and iron.
Has an atomic number of 15.
What is Phosphorus?
What are the three main classes of elements?
What are metals, nonmetals, and metalloids?
This number reflects the number of neutrons and protons in the nucleus of an atom.
What is the atomic mass?
How many energy levels does sodium have?
Three energy levels as it is in the third period of the periodic table.
The four main elements that make up the human body and most living things are?
What is hydrogen, oxygen, nitrogen, and carbon.
Elements in the center of the periodic table, along the zig-zag, have properties of both metals and non metals.
What are metalloids?
How many electrons does Nickel have?
28
Has 8 neutrons.
What is Oxygen?