This document contains a unit check on chemistry with questions about the smallest unit of matter, atoms bonding together to form compounds or molecules, early atomic models proposed by scientists like Thomson, Rutherford, Bohr, and Schrodinger & Heisenberg. It also has questions labeling parts of the periodic table like atomic number, symbol, element name, atomic weight, number of protons, and mass of protons and neutrons for the element mercury. Additionally, it asks about the direction periods and groups are read on the periodic table and where metals are found. Finally, it asks for atomic number, number of protons, number of shells, and number of valence electrons for oxygen and calcium.

1. UNIT CHECKS:
CHEMISTRY 1
Robin D. Seamon

2. U N I T C H E C K1. Smallest unit or building block
of matter: __________
2. Multiple atoms joined
together: ____________
3. LABEL A
4. LABEL B
5. LABEL C
6. LABEL D
How did each describe the atom?
7. Joseph Thomson
8. Ernest Rutherford
9. Niels Bohr
10. Schrodinger & Heisenberg
B
C
+
particles:
D
no charge
particles
A
-
charge
particles
WORD BOX:
A- cloud model B- plum pudding model
C- onion model
D- described nucleus & empty space of atom

3. HEADER:REVIEW:Element,Compound,orMixture?
3

4. Label the following parts for the element shown:
1. atomic number ____
2. symbol
3. element name
4. atomic weight
5. number of protons
6. mass of protons & neutrons
7. Which way are periods read on the Periodic
Table of Elements? (Draw arrows)
8. Which way are Groups/Families read on the
Periodic Table of Elements?
9. Where are metals found on the Table?
10.What does the zig-zag line show?
U N I T C H E C K-
Periodic Table
80
Hg
200.59
Mercury

5. Answer the following things about the elements
below.
1.Atomic Number _______
2.Number of protons ______
3.Number of shells ________
4.Number of valence electrons _________
Oxygen
5.Atomic Number ______
6.Number of protons _______
7.Number of shells _______
8.Number of valence electrons _______
Calcium
U N I T C H E C K-
Periodic Table2