21. A phosphide ion has: A) B) C) 10 protons and 13 electrons 12 protons and 15

Question

21. A phosphide ion has: A) B) C) 10 protons and 13 electrons 12 protons and 15 electrons 15 protons and 15 electrons D) E) 15 protons and 18 electrons 18 protons and 21 electrons 22. Two isotopes of an element differ in their A) symbol. B) atomic number. C) atomic mass. D) E) number of protons. number of electrons. 23. Calculate the molecular mass of potassium permanganate, KMnO 24. Which one of the following is an ion? 25. How many protons and electrons are present in one Br ion? A) 52 amu B) 70 amu C) 110 amu D) 158 amu E) 176 amu A) B B) NacI C) He D) C E) none of the above A) 35 p, 35 e B) 80 p, 81 e C) 35 p, 34 e D) 35 p, 36 e E) 80 p, 34 e 26. An iron(II) ion has: A) 24 electrons and a charge of 2+ D) 28 electrons and a charge of 2+ B) 24 electrons and a charge of 2 E) 28 electrons and a charge of 2- C) 26 electrons and a charge of 2+ 27. The elements in a row of the periodic table are known as A) metalloids. B) a period. C) noble gases. D) a group. E) nonmetals. 28. Which of the following elements is NOT a good conductor of electricity? 29. An cation is defined as A) B) C) D) a charged atom or group of atoms with a net negative charge. a stable atom. a group of stable atoms. a charged atom or group of atoms with a net positive charge.

Explanation / Answer

21 answer d

P^-3 phophide ions

22 answer c atomic mass

23 molar mass of kmno4 is 158 amu. D ANSWER

24 ANSWER A

25 answer D

35 PROTON 36 electron

26 ANSWER A

27 B

28 A

29 D

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