Subatomic Particles
How many protons, neutrons, and electrons are present in a neutral atom of Silicon?
Protons = 14
Neutrons = 14
Electrons = 14
Further Explain: How did you find the number of neutrons? Why are the number of protons and electrons the same?
How do you calculate the average atomic mass?
Using the naturally occurring isotopes of a given element, you multiple their atomic weight by the percent abundance (translated into decimal form), add up all of the isotopes information, and then you will have the average atomic mass.
Group 1 on the periodic table is known as what?
Alkali Metals
Name this ion: ClO4-
Perchlorate
Lone pairs are identified by ____ in lewis structures. Bonds are identified by ____ in lewis structures.
Dots, lines.
(a) lost neutrons
(b) gained neutrons
(c) lost electrons
(d) gained electrons
(c) Lost electrons
Further Explain: How does the loss of an electron create a positively charged atom?
Rubidium has 2 naturally occurring isotopes, Rb-85 and Rb-87. Rb-85 has an abundance of 72.2% and Rb-87 has an abundance of 27.8%. What is the average atomic mass of Rubidium?
85.556 or 86 amu.
Group 8 on the periodic table is known as what?
Noble Gases
Name this ion: HCO3-
Hydrogen Carbonate or Bicarbonate
Most elements need _ electrons around them for their shells to be full. The exception to this is the element ____.
8, Hydrogen
Identify the parts of isotope notation : AZE+Y
A = Mass number
Z = Atomic number
E = Element
Y = Charge of atom
Magnesium has 3 isotopes: Mg-24 (78.70%), Mg-25 (10.13%), Mg-26 (11.7%). The average atomic mass of Mg is 24.3050. Mass of Mg-25 is 24.98584, and Mg-26 is 25.98259. Find the mass of Mg-24.
23.8044 amu is the mass of Mg-24.
Further Explain: Does this mass makes sense regarding the problem?
Write the electron configuration for Carbon.
1s2, 2s2, 2p2
Further Explain: How can you "double check" that you have written the electron configuration correctly?
Is KF ionic or covalent?
Ionic
Further Explain: How can you identify that this compound is ionic rather than covalent?
If a structure has 3 "things" around the central atom, then its electron geometry is ____.
Further Explain: What exactly is meant by "things" in this question?
Write the isotope notation for the following: An element with 17 protons and a -1 charge.
3517Cl-1
Further Explain: How did you know that the element must be Chlorine? What happened to the number of electrons to give this atom a -1 charge?
Electron's locations are described based on their energy using: principle quantum numbers, subshell, orbitals. Define these 3 terms.
Principle Quantum Number = describes the "shell" or energy level (using numbers 1, 2, 3...)
Subshells = Describes the specific region within a shell (using s, p, d, f)
Orbitals = Regions within a subshell that can hold a max. number of 2 electrons
Write the electron configuration for Cl-1
1s2, 2s2, 2p6, 3s2, 3p6
OR
[Ar]
Further Explain: Why can Cl-1 be identified as the Noble Gas Argon?
Covalent, Pentaphosphorus Decoxide
Further Explain: What are the covalent compound naming prefixes for 1-10?
Electron Geometry = Tetrahedral
Molecular Geometry = Bent
Further Explain = Can the electron geometry and molecular geometry ever be the same?
Explain the difference between atomic number, mass number, and average atomic mass.
Atomic Number = The number of protons of a given element
Mass Number = The number of protons + the number of neutrons
Average Atomic Mass = The average atomic mass of an element is the weighted average mass of the atoms in a naturally occurring sample of the element.
How many orbitals are in each of the following subshells: s, p, d, f?
S = 1 orbital
P = 3 orbitals
D = 5 orbitals
F = 7 orbitals
How many valence electrons are present in LiF?
1 + 7 = 8 valence electrons
Further Explain: How can you identify the number of valence electrons using the periodic table?
Name this compound : H3PO4
Phosphoric Acid
Identify the electron geometry and molecular geometry of NO3. What is the angle of this structure?
Both are trigonal planar, angle is 120 degrees.