Year 8 Science · Unit 2 · Lesson 20
Foundation Worksheet
Learning Goals
Match each term to its definition
Draw a line connecting each term on the left to its correct definition on the right. Or write the matching letter next to each term.
| Term | Your answer | Definition |
|---|---|---|
| Atomic number | A. Two or more different elements chemically joined together in fixed ratios. | |
| Mass number | B. A vertical column in the periodic table; elements in the same column share similar chemical properties. | |
| Isotope | C. The number of protons in the nucleus of an atom; it identifies which element the atom is. | |
| Metalloid | D. The total number of protons and neutrons in an atom's nucleus. | |
| Compound | E. An element with properties between those of metals and non-metals; silicon is the most common example. | |
| Group | F. Atoms of the same element that have the same number of protons but a different number of neutrons. |
True or False? Fix the false ones
Circle T or F for each statement. If the statement is false, rewrite it correctly on the line below.
1. The atomic number of an element equals the number of protons in its nucleus.
Correct it:
2. Elements in the same period of the periodic table have similar chemical properties.
Correct it:
3. Metals are generally good conductors of heat and electricity.
Correct it:
4. Rutherford's gold foil experiment showed that atoms are solid spheres with no internal structure.
Correct it:
5. A compound has completely different properties from the individual elements that make it up.
Correct it:
1. Explain the difference between an element and a compound. Give one example of each.
2. Name the four atomic models in the order they were developed and state the key change each one made to our understanding of the atom.
Wrap Up
Write three key ideas you will remember from Unit 2.