Atoms
An element's atomic number tells us what? (2 things)
What is the number of protons and electrons in an atom?
Special substances made up of two or more elements combined.
What is a compound?
This theory helps to explain the physical characteristics of matter.
What is the Particle theory of Matter?
The number of currently known elements in the periodic table.
What is 118?
The number of sodium atoms in a table salt molecule. Hint: the symbol for table salt is NaCl
What is 1 sodium atom?
The chemical symbol for water.
What is H2O?
How many atoms is water made up of?
What is three?
The periodic table is organized into ________ and _________?
What what are rows (periods) and columns (groups)
Two atoms bonded together make a _____?
What a molecule?
The 2 in the chemical formula H2O means this.
What is two atoms of hydrogen?
Is the following a chemical or physical change?
Melting a candle
What is a physical change?
Which of the following elements is a metal:
A. Carbon
B. Chlorine
C. Lithium
D. Oxygen
E. Sulphur
What are metals, nonmetals and metalloids?
What is the formula for one molecule of Hydrogen gas?
What is H2?
This type of bond is formed when atoms share electrons to achieve a full outer energy level.
What is a covalent bond?
Give 3 properties of the particles in a solid.
Strong attraction between the particles
Particles are close together with little space between them.
Particles have little movement and vibrate in place.
These particles orbit the nucleus of an atom.
What are electrons?
Name one common element that is used as a fuel source.
What is carbon or hydrogen?
The number of carbon atoms in carbon dioxide molecule.
What is one?
Table salt is an example of a compound with this type of bond.
What is an ionic bond?
Carbon dioxide is an example of:
A. A single atom
B. A molecule
C. A compound
D. An element
What is B and C?