Two atoms are isotopes if they have the same: mass number, but different atomic
ID: 999541 • Letter: T
Question
Two atoms are isotopes if they have the same: mass number, but different atomic number number of electrons, protons, and neutrons number of neutrons, but a different number of protons number of protons, but a different number of neutrons none of these 28 An atomic particle having 30 protons. 35 neutrons, and 28 electrons has a charge of +2 an atomic no. of 35 a mass no. of 30 an atomic no. of 28 none of these 2, The number of neutrons in Br-80 is: 115 80 45 35 none of these The correct name for K_2SO_4 is: potassium sulfate dipolassium sulfate potassium sulfite potassium oxide sulfate none of these The correct name for N_2O_5 is: nitric oxide nitrogen pentoxidc dinitrogen pentoxide nitrous oxide none of these The formula for calcium nitrate is: Ca(NO_3)_2 (b) CaNO_3 (c) Ca_3(NO_3)_2 Ca_2NO_3 none of these The chemical properties of an element are primarily dependent upon: The electronic configuration of the element The number of neutrons present The number of electrons in the innermost shell of the atom The number of principal (main) energy levels of the element None of theseExplanation / Answer
Hi, thank you for your question.
1. Isotopes are atoms which have the same atomic number (protons) but different mass number (number of protons plus neutrons). So the answer is d.
2. Since you have 30 protons, atomic number is 30. 28 electrons means there are 4 electrons less so the charge should be +4 and also 35 nuetrons so there are a total of 65 protons and nuetrons so the mass number is 65. Since none of the choices match our answers, the answer is none of these (e).
3. Since Bromine has the atomic number of 35 so it should have 35 protons. Since the mass number is the total of protons and nuetrons and it is 80 so the number of neutrons is the difference 80-35=45.
4. The correct name is Potassium sulfate. since SO4 is the sulfate.
5. N2O5 is called dinitrogen pentoxide since it has two nitrogen and five oxygen atoms.
6. Calcium has a valence of 2 and nitrate has a valence of 1. So 1 calcium ion can bind with two nitrate ions. The formula is Ca(NO3)2
7. Chemical properties of elements are mainly dependent upon the electronic configuration of the element. Since the electrons decide how an element reacts under different conditions.
Hope that helps.