Density
What is density? (Use your words, not your formulas)
The amount of matter (mass) packed into a given space (volume).
How many significant figures are present : 0.0000001
1
What "rule" helps you determine this # of SF?
The 3 particles of the atom are :
protons, neutrons, and electrons.
What are their respective charges?
What is an isotope?
Atoms of the same element with different number of neutrons, giving the atom a different mass number.
Find the error :
1s2, 2p6, 2s2, 3s2, 3p6 ...
2p6 does not come before 2s2
g/cm^3
Why are these equal units?
How many significant figures are present in 320001?
6
The number of protons in one atom of an element determines the atom's ____.
The number of electrons determines the ____ of the element.
identity ; charge
Carbon-12 has how many protons, neutrons, and electrons?
6, 6, 6
Write the electron configuration for copper
1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d9
Can you double check your work? How?
An unknown liquid occupies a volume of 5 mL and has a mass of 40 grams. Find its density.
D = 8.0 g/mL
Answer with the appropriate number of significant figures : 28.367 / 3.74 =
7.58
How can you calculate the number of neutrons in element?
Mass Number - Protons = Neutrons
Chromium-63 has how many protons, neutrons, and electrons?
24, 39, 24
Write the electron configuration for iodine.
1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d10, 4p6, 5s2, 4d10, 5p5
True or False? More heavy = More dense
Yes
Can you prove it?
Convert 1.2 X 10 ^ -4 to standard notation.
0.00012
Give the symbol of the element and the number of neutrons in one atom : Flurorine
F
10 neutrons
How did you calculate 10 neutrons?
Germanium-68 has how many protons, neutrons, and electrons?
32, 36, 32
Write the abbreviated electron configuration for chlorine.
[Ne], 3s2, 3p5
Silver has a density of 10.5 g/cm^3 and gold has a density of 19.3 g/cm3. Which would have the greater mass, 5 cm^3 of silver or 5 cm^3 of gold?
Gold
96.5 g > 52.5 g
Convert 5,050 to scientific notation.
5.05 X 10 ^ 3
Give the symbol of the element and the number of neutrons in one atom : Mercury
Hg
121
True or False? Isotopes are negatively charged due to the different number of neutrons.
False.
EXPLAIN
Write the abbreviated electron configuration for nobelium.
[Rn] 7s2, 5f14