Elements
What is the element symbol for nitrogen?
N
What are the three subatomic particles and what are their charges?
Proton, Neutron, Electron
Positive, Neutral, Negative
What does an atom gain or lose to become an ion?
Electrons
Which subatomic particle differs between isotopes?
The neutrons
What does amu stand for?
Atomic Mass Unit
What is the element who's symbol is Ni?
Nickel
Indium has 49 protons, 66 neutrons, and 49 electrons. What is the mass number for Indium?
115 amu
If a Bromine ion has charge of -1, how many total electrons does it have?
36
Iridium has two isotopes, Ir-191 (37.58%) and Ir-193 (62.42%). What is it's average atomic mass rounded to two decimal places?
192.25 amu
What is the atomic mass always the same as?
What element has an atomic number of 48
Cadmium
Polonium has 84 protons, 84 electrons, and a mass number of 209. How many neutrons does it have?
125 neutrons
If Rhodium (Rh) has 38 electrons, what is it's charge?
+7
Iodine has three isotopes that have masses of 127.0 amu (80%), 126.0 amu (17%) and 128.0 amu (3%). What is the average atomic mass of Iodine?
126.86 amu
How do you calculate mass number?
What is the atomic number for gold?
79
Tungsten (W) has a mass number of 184 and 110 neutrons. What is tungsten's atomic number?
74
Calcium has 20 protons, 20 neutrons, and 18 electrons, write the element symbol in the correct format.
4020Ca2+
Magnesium has three isotopes: Mg-24 (78.7%), Mg-25 (10.13%), and Mg-26 (11.17%). What is the atomic mass of magnesium rounded to two decimal places?
24.33 amu
How do you calculate the number of electrons in an ion?
# Electrons = #Protons - Charge
What is the symbol and atomic number for tungsten?
W, 74
Rubidium has 37 protons, 49 neutrons, and 37 electrons. Write the symbol in the correct format.
8637Rb
Tantalum has 73 protons, 108 neutrons, and 68 electrons, write the element symbol in the correct format.
18173Ta5+
An element has four isoptopes: 50 amu (4.35%), 52 amu (83.8%), 53 amu (9.5%), and 54 amu (2.35%).
a. what is the atomic mass?
b. using your periodic table, what element is it?
a. 52.055 amu
b. Chromium
How many neutrons are in uranium (AN = 92)?
146 neutrons