How many significant figures does the result of the following operation have? Wh

Question

How many significant figures does the result of the following operation have? What is it called when two or more atoms are joined together? How many electrons does a neutral atom of cobalt-59 have? How many unpaired electrons are there in the ground state of Al^3+? Which of the following is a property of ionic compounds? Which of the following choices correctly represents the ionization of potassium? Which of the following correctly represents the formation of a chloride anion from a chlorine atom? What is the formula of the ionic compound formed from ions of aluminum and phosphorus?

Explanation / Answer

1. 8.5201 + 1.93 = 10.4501 six significant figures

2. D.molecule
two or more atoms are joined together to form molecule

3. C. 59 electrons
Neutral atom contains atomic number equal to electrons and protons

4. C 0
Al^3+ = 1s2 2s2 2p6   no un paired electrons

5. B. high melting points

6. B
K -----> K^+1
19 (4s^1) 18(4S^0) Ar

7. D

8. D AlP

9. Sr3N2

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