39. Write the abbreviated hyphen notation (element name-mass number) of the most common isotope of an element that has 6 valence electrons based on its electron arrangement in the ground state (there are more than one answer, give only one possible answer, don't put space between any part of the answer, and type all LOWRCASE LETTERS PLEASE)1 pointYour answer

An atom has 44 protons, 44 electrons and 62 neutrons. Which symbol below correctly represents this atom?Question 11Answer106Ru62Ru62Tb106Tb150Ru

Isotopes of an element have the same number ofA. protons and electrons.B. protons and neutrons.C. neutrons and electrons.D. protons, neutrons and electrons.16. What is the difference between two neutral atoms represented by the symbols59 5927 28Co and Ni ?A. The number of neutrons only.B. The number of protons and electrons only.C. The number of protons and neutrons only.D. The number of protons, neutrons and electrons.17. How many electrons are there in one24 212 Mg + ion?A. 10B. 12C. 14D. 2218. Copper consists of the isotopes 63Cu and 65Cu has a relative atomic mass of 63.55. What is the most likelycomposition?63Cu 65CuA. 30 % 70 %B. 50 % 50 %C. 55 % 45 %D. 70 % 30 %19. Information is given about four different atomsatom neutrons protonsW 22 18X 18 20Y 22 16Z 20 18Which two atoms are isotopes?A. W and YB. W and ZC. X and ZD. X and YPage 9 of 77

3. Which element in the periodic table forms maximum number of compounds ?H O S C

Isotopes of an element have the same number ofA. protons and electrons.B. protons and neutrons.C. neutrons and electrons.D. protons, neutrons and electrons

An isotope represented as S-34:   Group of answer choicesis an isotope of sodium.contains exactly 18 neutrons.has 34 protons.must have exactly 18 electrons.none of the above