Nucleus
Energy Levels
Subatomic Particles
Identify the Element
Isotopes
100
Where is the nucleus in the atom?
The center
100
Where is the electron cloud?
The outside rings of the atom.
100
What charge do protons, neutrons and electrons have?
Protons +
Neutrons 0
electrons -
100
What elements has 15 protons?
Phosphorous
100
What subatomic particle never changes between two isotopes?
Number of protons
200
What is in the nucleus?
Protons and Neutrons
200
What is in the energy levels?
electrons
200
What makes the mass number?
protons + neutrons
200
What element has a mass number of 27 and 14 neutrons?
Aluminum
200
What changes between two isotopes of Uranium?
Number of neutrons so atomic mass
300
What inside the nucleus identifies the element?
The number of protons
300
What is the charge of the energy levels?
negative
300
What identifies an element?
Protons
300
Identify the element below.
sodium
300
Three atoms are listed below. Identify which two are isotopes.
1. P=4 N=5 E=4
2. P=5 N=5 E=5
3. P=4 N=6 E=4
Number 1 and 3 because they have same number of protons but different number of neutrons
400
What is the charge of the nucleus?
positive
400
What is the atomic number?
number of protons
400
Identify the isotope below.
1939X
Potassium
400
The average atomic mass for Iron is 55.845. It has three isotopes, Fe-54, Fe-55, and Fe-56. Which isotope is in the greatest abundance? How do you know?
Fe-56 because the average atomic mass is closest to this isotope's mass
500
Compared to the rest of the atom, is the nucleus small or large?
small
500
Why can you assume that the number of protons = the number of electrons?
Protons are positive and electrons are negative and an atom must be neutral.
500
What is the symbol for an atom that has 12 protons, 13 neutrons, and 12 electrons?
2512Mg
500
Calculate the average atomic mass of sulfur, which occurs as two isotopes that have the following atomic masses and abundances in nature: S-32, 87.54% and Li-33, 12.46%.
32.125 amu