Elements
What is this element: Pb
Lead
Molecule is the ______ unit a material can be divided into without changing the properties of the material.
Smallest
Is water a chemical compound.Explain why.
YES
Chemical formula is the _____ for a chemical substance.
Recipe
Who invented the periodic table
Dmitri Mendeleev
Name one element with the atomic number of 12.
Magnesium.
The atoms in the molecules can be same or _______
Different
The elements lose their individual chemical proprieties,and the compound has __________ __________
New properties.
Write the formula for water.What is the subscript.
H2O subscript is the 2
How old is the periodic table
155
An element is...
A substance that has a symbol on the periodic table and is made of only 1 type of atom.
Molecules are formed when two or more atoms bond together ________
Chemically
A chemical substance formed when ____ or more different elements bond in a specific proprieties.
2
What is the subscript in CO2
THe subscript is 2.
What has the atomic number of 102
nobelium
What element has an atomic number of 19.
POTASSIUM
Name 3 examples of molecules are...............
O2,CO2,H2O
Is NO a compound
YES
What is the chemical formula for carbon?
C
What is the element with the atomic number of 88
Radium
Can there be different types of atoms in the element?
NO because there has to be the same atoms to make a molecule!!
These bonds form a result of ________ valence electrons among atoms.
Sharing
How is a compound different from a mixture.
Compounds are substances which can be formed by chemically combining two or more elements. Mixtures are substances that are formed by physically mixing two or more substances.
What is the chemical formula for glucose?
C6H12O6
What is the atomic number for sodium
11