Periodic Table
How many elements are there?
118
What is a compound?
A substance made up of atoms of two or more different elements joined by chemical bonds.
What is a proton?
A positively charged particle
What is a mixture?
A combination of two or more substances that are not chemically combined.
What is a atom?
Smallest piece of matter that is still considered an element.
What is a metalloid?
Found along the 'staircase'. Have properties of both metals and nonmetals.
What is a chemical symbol?
A one or two letter representation of an element.
What is a neutron?
Neutrally charged particle.
What is a separation?
The process of removing or separating the components of a mixture.
What is a subatomic particle?
Pieces of matter that make up atoms.
What are nonmetals?
brittle , dull, poor conductors of heat and electricity, and have much lower melting and boiling points.
What is a chemical bond?
The force that holds two atoms together.
What is a electron?
A negatively charged particle.
What are the 3 main types of mixtures.
solution, colloid and suspension.
What is the atomic mass?
Indicates the number of protons and neutrons found in an atom of a specific element.
What are horizontal rows on the periodic table called?
periods
What is physical property?
A characteristic of a pure substance that can be observed without changing it into another substance.
What is the nucleus?
Center of an atom.
What are solutions?
These types of mixtures have the smallest sized particles.
What is an isotope?
Different versions of an element. Atoms that have the same number of protons, BUT different number of neutrons.
What are vertical columns on the periodic table called?
groups
What is a molecule?
The simplest structural unit of an element or compound.
What is mass?
Amount of matter in an object.
What is a suspension?
This type of mixture has the largest sized particles.
What are valence electrons?
Electrons on the outermost energy level of an atom.