Periodic Table
An element is identified by its number of these particles.
Protons
In a Bohr model, where are the electrons located?
the energy levels/shells surrounding the nucleus
How many total atoms are in H₂O?
3
In H₂O, what does the small 2 tell you?
That there are 2 Hydrogen atoms
What makes up an element?
A. One type of atom
B. Two types of atoms
C. Different types of molecules
D. One type of molecule
A. One type of atom
If an element is in Group 1, Period 5, what element is it?
Rubidium (Rb)
How many electrons can fit in the first energy level?
2
How many total atoms are in H₂SO₄?
7
In Ca(OH)₂, which elements are affected by the 2 outside the parentheses?
Oxygen and Hydrogen
What makes a molecule?
A. Cells
B. Different amounts of atoms
C. Different amounts of compounds
D. Waves
B. Different amounts of atoms
If an element is in Group 13, Period 4, what element is it?
Gallium (Ga)
Draw a Bohr model for carbon. How many electrons should it have?
6
How many total atoms are in 2Mg(OH)₂?
10
In 3Na(SO₄), what does the coefficient 3 affect?
The entire formula/all the atoms
Which type of element has properties of both metals and nonmetals?
metalloid
An element has 15 protons. What is its atomic number and element?
15 and phosphorus (P)
An atom has 2 electrons in its first shell and 8 in its second shell. What element is it?
Neon (Ne)
How many total atoms are in Al₂(SO₄)₃?
17
What is the difference between a coefficient and a subscript?
A coefficient multiplies the entire formula. A subscript tells how many atoms of an element or group are present.
Which group is generally considered the most reactive metals?
A. Transition metals
B. Alkaline Earth Metals
C. Alkali Metals
C. Alkali Metals
An element is in Group 16, Period 2. Identify the element and tell me how many protons it has.
oxygen (O) and 8 protons
Draw the Bohr model for magnesium. How many electrons should be in each energy level?
2, 8, 2
How many atoms of oxygen are in 2Mg(OH)₂?
4 oxygen atoms
How many atoms of each element are in 3Na(SO₄)?
3 Na, 3 S, and 12 O
Explain the difference between a metal, nonmetal, and metalloid.