Elements, Compounds, Molecules
What is the difference between elements and compounds?
Elements are made of one type of atom while compounds are at least two.
What direction do groups and periods travel?
Groups are vertical, and periods are horizontal.
Where are metals located on the periodic table?
Metals are located on the left of the stair step line.
What is the center of the atom called?
Nucleus
What is the charge of each subatomic particle?
Protons = Positive, Neutrons = Neutral, Electrons = Negative
What is the chemical formula for carbon dioxide?
CO2
What is a period on the periodic table?
A period is a section of the periodic table that have the same number of electron shells.
Where are nonmetals and metalloids found on the periodic table?
Nonmetals are to the right of the stair step line and metalloids are found on the stair step line.
What is the nucleus made of?
Protons and neutrons
Where are protons and neutrons located?
Protons and neutrons are in the nucleus.
What is a molecule?
A group of bonded atoms.
Define atomic mass and its purpose.
Atomic mass is the approximate equivalent of protons and neutrons in an atom. It is used to solve stoichiometry problems.
State distinct properties of metals.
Metals are good conductors of heat and electricity, malleable, ductile, and are solid at room temperature, except for mercury.
What has a negative charge inside of an atom?
Electron
Where are electrons located?
Electrons are in the electron cloud.
The number of chlorine atoms in common table salt.
1 atom.
Define atomic number and its purpose.
Atomic number refers to the number of protons in the nucleus. The atomic number is used to determine chemical properties and the location on the periodic table.
State distinct properties of nonmetals.
Nonmetals are not malleable, brittle, and are poor heat and electrical conductors.
What is the purpose of the nucleus?
The nucleus controls and regulates the activities of the cell.
What is the mass of protons and neutrons?
1.67 x 10^-24 grams
All matter in the universe contains these.
Atoms/Molecules
What is a group on the periodic table?
A group is a group of elements that share similar chemical behavior.
State properties of metalloids.
Metalloids are brittle, shiny, and are mediocre electrical conductors.
What is the outer shell electron called?
Valence electron
What is the mass of electrons?
9.10x10^-31