Flashcards
Fundamentals
Flashcards do conjunto (22)
- 1What is the nucleon number?The protons + neutrons in the nucleus (top number on periodic table element)
Symbol: A - 2What is the atomic number / proton number?The number of protons in the nucleus (bottom number on periodic table element)
Symbol: Z - 3The proton number also tells us how many.....Electrons there are (as number of protons=number of electrons)
- 4What is an isotope?The same element but with a different number of neutrons
- 5What is the nucleon number of carbon 12?12
- 6What is the symbol for charge and what is it measured in?Symbol Q and measured in Coulombs (symbol C)
- 7What is "elementary charge" (or magnitude of the charge of an electron)e = 1.60 x 10^-19 C
- 8What is the charge of an electron?-1.60 x 10^-19 C
(same as -e) - 9What is the charge of a proton?1.60 x 10^-19 C
(same as +e) - 10What is the mass of a proton? (mP)1.673 x 10^-27 kg
- 11What is the mass of a neutron? (mN)1.675 x 10^-27 kg
- 12What is the mass of an electron? (mE)9.11 x 10^-31 kg
- 13What are the relative charges of the proton and the electron?Proton: 1
Electron: -1 - 14Define specific chargeCharge per unit mass for a particle
- 15How do we find the specific charge?Specific charge (Ckg^-1) = Charge (C) / Mass (kg)
- 16Find the specific charge of a proton:e / mp
1.60 x 10^-19 / 1.673 x 10^-27 = 9.58 x 10^7 Ckg^-1
(this works the same for electrons, just use mE instead of mP) - 17Why can't we find the specific charge of a neutron?A neutron has no charge
- 18How would find the specific charge of a non-ionic elementProton number x e / (number of protons x mP + number of neutrons x mN)
- 19Find the specific charge of an alpha particleAlpha particle = 4 nucleon and 2 proton
2e / 2(mP) + 2(mN) = 4.78 x 10^7 Ckg^-1 - 20How would find the specific charge of an ionic elementNumber of taken away electrons x e / number of protons x mP + number of neutrons x mN + number of remaining electrons x mE
- 21An element has a nucleon number of 113 and a proton number of 49. 3 electrons are taken away to form an ion. Calculate it's relative charge.3e / 49mP + 64mN + (49-3)mE
= 2.54 x 10^6 Ckg^-1 - 22How would you calculate charge on its own if an element had 2 protons?2e (answer = 3.98x10^6 Ckg^-1)