Electron shielding - Study guides, Revision notes & Summaries

AQA 2023 AS CHEMISTRY 7404/2 Paper 2 Organic and Physical Chemistry questions and answers verified What is the equation linking mass moles and MR? Mass=moles * MR What is the definition of Ar (relative atomic mass)? The average mass of an atom of an element compared to the mass of one twelfth of carbon 12. What does Mr stand for? Relative molecular mass Define relative isotopic mass. The mass of an isotope of an element compared to the mass of one twelfth of the mass of carbon 12 ...

Who discovered x-rays? Ans: Wilhelm Conrad Roentgen When were x-rays discovered? Ans: November 8, 1895 in Germany What are the 3 Cardinal Principals of radiation protection? Ans: Maximize distance, maximize shielding, minimize time What is Erythema? Ans: Reddening of the skin What is Anemia? Ans: Decrease of oxygen in blood, low blood count What is Leukopenia? Ans: Low WBC count What is epilation? Ans: Loss of hair What does ALARA stand for? Ans: As Low As Reasonably Achievable W...

In terms of a computer, what do the following acronyms stand for: CRT LED LCD ROM RAM - ANS CRT: cathode ray tube LED: liquid emitting diode LCD: liquid crystal display ROM: read only memory (permanent, can't write over) RAM: random access memory (temporary, lost when computer turns off) What is used for MRI magnet shielding? What is used for MRI radiofrequency shielding? - ANS -steel plates -metal mesh (Faraday cage) What strength of MRI has been shown to have n...

When were x-rays discovered? Ans: November 8, 1895 in Germany What are the 3 Cardinal Principals of radiation protection? Ans: Maximize distance, maximize shielding, minimize time What is Erythema? Ans: Reddening of the skin What is Anemia? Ans: Decrease of oxygen in blood, low blood count What is Leukopenia? Ans: Low WBC count What is epilation? Ans: Loss of hair What is collimation? Ans: Limits the size/area of the x-ray beam What is a proton? Ans: Positively charged, in nucleus...

AS-level AQA Chemistry questions and answers What is the charge of a proton? - ANSWERS +1 What is the charge of a neutron? - ANSWERS 0 What is the charge of an electron? - ANSWERS -1 What is the mass of a proton? - ANSWERS 1 What is the mass of a neutron? - ANSWERS 1 What is the mass of an electron? - ANSWERS 1/1800 What is an isotope? - ANSWERS Isotopes of an element are atoms with the same number of protons but different numbers of neutrons. Why do isotopes of an element all have t...

OHIO GXMO STUDY GUIDE REVIEW QUESTIONS AND ANSWERS WITH SOLUTIONS 2024 Who discovered x-rays? - ANSWER Wilhelm Conrad Roentgen When were x-rays discovered? - ANSWER November 8, 1895 in Germany What are the 3 Cardinal Principals of radiation protection? - ANSWER Maximize distance, maximize shielding, minimize time What is Erythema? - ANSWER Reddening of the skin What is Anemia? - ANSWER Decrease of oxygen in blood, low blood count What is Leukopenia? - ANSWER Low WBC count What...

________ Forces the wire to make better electrical contact with the contact tube. - cast ___________ are less likely to absorb moisture than the seamed electrode. - Seamless electrodes ________Weld faces tend to trap slag along the toe of the weld. - convex _______Helps the weld by protecting the hot metal from the effects of the atmosphere. - slag A disadvantage of the perpendicular technique is limited visibility of the weld - True A fillet weld is the type of weld made on_________. - A l...

Inorganic AS AQA Chemistry What is a d-block (or f-block) element? - CORRECT ANSWER-An element that forms one or more stable ions with a partially filled d (or f) orbital What is an s-block (or p-block) element? - CORRECT ANSWER-An element with its outer electrons in the s (or p) orbitals What is the scientific name for the rows on the Periodic Table? - CORRECT ANSWER-Periods What is the scientific name for the columns on the Periodic Table? - CORRECT ANSWER-Groups What does the group numbe...

RADT 142 Unit 1 Test Questions and Answers Radiation injuries - Answer-Erythema, alopecia, anemia and cataract Electrical Energy - Answer-Work that can be done when an electron moves through an electrical potential difference. Cm in 1 inch - Answer-2.54 3 Cardinal Principles of Radiation Protection - Answer-Time, distance and shielding Collimation - Answer-Restriction to certain body parts Filtration - Answer-Metal filters that absorb radiation Radiation injuries - Answer-Eryt...

Isotopes - Same # protons, different # of neutrons 10 5 B (Mass #/Atomic Mass) - p=5 N=10-5=5 e=5 Orbital diagrams - n=# in orbital diagram l: s=0 p=1 d=2 f=3 Ml= timeline w/ 0 Spin: always +1/2 and -1/2 energies affecting atomic orbitals - nuclear charge shielding (reduced full nuclear charge to Zeff) Atomic radus - decreases b/c INCREASED electrostatic attraction Electron affinity - -the energy change when an electron is accepted by atom in gases state (anion formed) -smaller ele...