Valence electrons
How many valence electrons are in this element: H in group 1
It has 1 valence electron
What group is this element in: Pt
It is in group 10
What are the three classifications of matter
Mixture, element, and compound
What is an isotope?
An atom that has the same number of protons but different number of neutrons.
How many valence electrons are in this element: B in group 13
3 valence electrons
What group is this element in: Li
It is in group 1
What is the definition of mixture?
Mixture is a combination of two of more substances that is not chemically combined.
What does the Atomic number tell you?
It tells you how many protons are in an atom of an element.
How many valence electrons are in this element: Cu in group 11
1 valence electron
What group is this element in: Ti
it is in group 4
What is the definition of elements?
A substance that cannot be separated or broken down into simpler substances by chemical means.
What is Atomic mass?
It describes the mass of a unit.
How many valence electrons are in this element: W in group 6
it has 74 valence electrons
What group is this element in: Pb
It is in group 14
What is the definition of compound?
A substance made up of atoms of two or more different elements joined by chemical bonds.
All atoms of a given element are exactly alike atoms of different elements could join to form compounds.
How many valence electrons are in this element: U in group 7
it has 6 valence electrons
What group is this element in: Xe
It is in group 18
What is the definition of matter?
Anything that has mass and takes up space.
What is the definition of diatomic?
A molecule made up of two atoms.