atom
What is an atom?
The building block of all matter
what is an element?
A pure substance made of only one type of atom
What is the formula for density?
mass divided by volume
What is matter?
Matter is anything that has mass and takes up space
what does the periodic table do?
organizes all known chemical elements by atomic number, electron configuration, and recurring chemical properties
What is the charge of a neutron?
neutral
What is an atomic number?
The number of protons in an atom's nucleus
What is the formula for mass?
density x volume
What are the three common states of matter?
Solid, liquid, and gas
What is a group?
A vertical column. There are 18 groups. Elements in a group share similar traits because they have the same number of valence electrons
What is the charge of a proton?
Positive
How are elements arranged?
By increasing atomic number on the periodic table
what is the formula for volume?
mass divided by density
Do solids change shape easily?
No. Solids have a fixed shape and a fixed volume
What happens to atomic size as you go down a group?
It increases because you add more electron shells.
what is the charge of electrons?
negative
What is the symbol for gold?
Au
what is density?
A measure of how heavy something is for its size, describing mass and volume or it shows how tightly packed the matter or particles are inside an object
Do gases have a fixed shape or volume?
No. Gases have no fixed shape and no fixed volume. They fill their container completely
What happens to atomic size as you move left to right across a period?
It decreases because the stronger positive charge of the nucleus pulls electrons closer.
what is the middle of the atom called?
nucleus
what is the lightest element in the universe?
Hydrogen
what is volume?
the amount of three-dimensional space an object or substance takes up
What is it called when a gas turns into a liquid?
Condensation
What is the most reactive metal family?
Alkali metals