Bohr Diagrams
How many electrons can the first shell hold (maximum)
2
What element is Na?
sodium
How many protons and electrons are in magnesium?
12 protons, 12 electrons
How many neutrons are in Iodine-127?
74 (127-53)
The mass of an element is reported as 89.12 from the periodic table. Why isn't it a whole number?
It is a calculation based on all of the isotopes
How many energy levels/rings would an atom of Sodium need?
3
What is the symbol for aluminum?
Al
How many protons and electrons are in boron?
5 of each
What is the formula to find neutrons?
mass number-protons
3 isotopes of iodine exist, 126, 127, and 129. If the mass on the periodic table is 126.98, which isotope is most abundant?
127, closest to the mass on the periodic table so it is the most abundant.
What term is used to describe the electrons in the outermost shell?
Valence Electrons
What element is Pb?
Lead
Protons is equal to electrons and the ________ ________ of an element
atomic number
What is the mass number of a sample of oxygen with 8 neutrons?
16 (8+8)
What is the formula for average atomic mass?
(mass x %) + (mass x %)...
Draw the Bohr Diagram for Nitrogen
2, 5
What is the symbol for Cesium?
Cs
How many electrons are in bromine?
35
What is the mass of a sample of argon with 22 neutrons?
40 (18 + 22)
Calculate the average atomic mass (round to 2 decimal places) using:
Chlorine-35 (mass 34.9689 amu and 77.77% abundant)
Chlorine-37 (mass 36.9659 amu and 22.23% abundant)
35.41 amu
How many electrons are in the last/outermost shell of C?
What element has a symbol Ag?
silver
This element has 31 protons and 31 electrons. What is it?
Ga, Gallium
How many neutrons are in Phosphorus-31?
16 (31-15)
Iridium-191: 191.0 amu and 37.58%
Iridium-193: 193.0 amu and 62.42%
Determine the average atomic mass
192.25 amu