Electron configuration problem please help i don't understand it.?

Question

Potassium (K) ( 20N , 19P , 19e-)
charge __________ atom/ion
AN___________ MN___________

can you please help me solve it?

Answer 1

Charge: 0 -- atom
AN -- 19
MN -- 39

The charge refers to the elctric charge of the atom. Every proton has a charge of +1 and every electron has a charge of -1. Neutrons have no charge. The total charge of an atom is given by the total of all the individual charges - that is, 1*P + (-1)*e + 0*N, or simplfied, P-e (where P is the number of protons, e is the number of electrons, and N is the number of neutrons). In this case, P-e=0.

The atom/ion distinction is basically asking "does this atom have a nonzero charge?" If yes, it is an ion, otherwise it is a neutral atom. Here, the charge is zero, so you circle atom.

AN - this refers to the atomic number. This is simply another name for the number of protons.

MN - this is the mass number. It refers to the total number of particles in the atomic nucleus (it is called the mass number because this will always be approximately the atomic mass of the atom). This is simply the number of protons plus the number of neutrons.

Edit: to clear up any possible confusion from edsis_sg's answer - he's listing the properties of potassium atoms _in general_ when in an ionic bond. That does not have anything to do with the properties of the particular potassium atom described, where the number of electrons is explicitly indicated. The atomic number is NOT the number of electrons, it is the number of protons. A potassium atom with a charge of +1 will only have 18, not 19 electrons (your potassium atom does have 19 electrons, which is why it has a charge of zero). edsis_sg's formula for mass number is similarly incorrect. And the formula he gave you for the "stable configuration" is actually the total number of electrons in the nth shell, which is not the number of electrons in the nearest "stable configuration" (by which I assume he means the nearest configuration with a full valence shell). e.g. Rubidium tends to form bonds where it has charge +1, and thus would have 36 electrons, but 2n^2 gives 32 electrons (with n=4). In short, he doesn't know what he is talking about, but I felt it important to explain why he doesn't know what he is talking about so that you don't get confused with false information.

- Pascal

Answer 2

Potassium belongs to the Group IA in the periodic table. As such, it tends to form Cation with +1 charge. Another good indication is its electron number which is 19. Since electrons fill up the orbitals in each layer, the stable configuration will follow the equation, 2*n^2
, where n is the number of layers.

Potassium charge = +1
Atomic number = 19 (which is the no of electrons)
Mass number = 20 + 19 (which is the no of neutron + electrons)

hope it helps

Answer 3

Sulfur vapor is analyzed by using photoelectron spectroscopy (PES). Measurements be certain that photoelectrons related with the 1st ionization means of sulfur bypass with de Broglie wavelength ?=3.591 A?. what's the optimal wavelength (in meters) of radiation waiting to ionizing sulfur and producing this consequence? decide on which innovations/concerns you think of which you will could desire to follow to clean up the concern below. decide for on all that follow. Covalent Bond means Ionic Bond means unmarried-electron Atom Ionization means Multi-electron Atom Ionization means Electronegativity restricting Reagent Stoichiometry Bohr type Conservation of means Wave-Particle Duality Secondary Bonding LCAO-MO Titanium (Ti) could right be produced by using the reaction of steel sodium (Na) with titanium tetrachloride vapor (TiCl4). The byproduct of this reaction is sodium chloride (NaCl). Calculate the quantity of titanium produced (in kg) on the same time as a reactor is charged with seventy 8.0 kg of TiCl4 and 14.0 kg of Na. Which of precise right here diatomic molecules are isoelectronic to BN? learn all that follow. NO BeN C2 BeC decide on which innovations/concerns you think of which you will could desire to follow to clean up the concern below. decide for on all that follow. Covalent Bond means Ionic Bond means unmarried-electron Atom Ionization means Multi-electron Atom Ionization means Electronegativity restricting Reagent Stoichiometry Bohr type Conservation of means Wave-Particle Duality Secondary Bonding LCAO-MO you have used a million of two submissions : 5.0 factors For the emission spectrum of Be3+, calculate the backside wavenumber ?? (in inverse meters) of light produced by using electron transitions between n=2, n=3, and n=4.