Periodic Table
Write the element symbols for the following:
Aluminum, Calcium, and Beryllium
Al
Ca
Be
protons and neutrons
What is an isotope symbol? Write the generic symbol for it
AZXc
Write the isotope symbol for sulfur-32. It has gained two electrons.
Hint: use the equation charge = (# protons) - (# electrons) to determine charge
3216S2-
What is the atomic number of titanium?
Z=22
A horizontal ROW on the periodic table is called a _______, while a vertical COLUMN is called a _________.
period, group
Which subatomic particle has a charge of -1 and a negligible mass?
electron
How is mass number calculated?
Mass number (A) is # protons plus # neutrons
If an atom is neutral, what is true about its number of protons and electrons?
equal in number
What is the mass number for an atom of arsenic that has 42 neutrons?
75
Describe the location of metals, nonmetals, and metalloids relative to the stairstep line.
Metals - left
Nonmetals - right
metalloids - on
What is another name for the number of protons in an atom?
Atomic Number
What are the TWO conditions that must be true in order for two atoms to be isotopes?
1. same number of protons
2. different number of neutrons (different mass number)
In naturally occurring rubidium, 72.17% is rubidium-85 with a mass of 84.91 amu. 27.83% is rubidium-87 with a mass of 86.91 amu. Calculate the atomic mass for rubidium using the weighted average mass methods.
85.47 amu
List three properties of metals
shiny, conductive of heat and electricity, malleable, ductile, high melting points
Group 18 elements are called the ___________.
Group 2 elements are called the ____________.
noble gases; alkaline earth metals
Which subatomic particle(s) determine the mass of an atom?
Protons and neutrons only
Are these isotopes? Explain
carbon-14 and nitrogen-14
no, different elements
Write the isotope symbol for a neutral atom with 20 protons and 20 neutrons.
4020Ca
Is aluminum a metal, nonmetal, or metalloid?
metal
Representative (or main group) elements belong to groups _______. (List all the group #'s that belong to this category!!)
1, 2, 13-18
Are all atoms of a given element identical? Explain.
No, there may be isotopes (different numbers of neutrons)
Write the isotope symbol for an atom with 9 protons, 10 neutrons, and 10 electrons
199F-
Explain why this method of calculating the atomic mass of boron is incorrect. Boron has two isotopes: boron-10 and boron-11:
(10.01+11.01)/2
Does not account for percent abundance of each isotope
List the other group name for each group # below, if applicable:
Ex: group 1 = group 1A
14 = ___
18 = ___
4 = ___
4A
8A
4 (no other names)