Which is true about each element in a period or horizontal row of the periodic table? a. each element has one more outer shell than the element before it. b. each element has one more outer electron than the element before it. c. each element has one more isotope than the element before it. d. each element bonds with the element before it.

Where are chemicals found at work? a. only in cleaning products b. only in carpets and paint c. in every area of work d. only in food preparation submit

Noble gases are the most reactive elements on the periodic table. a. true b. false

There are 6.022, 104 atoms of hg in 1 mole of hg the number of atoms in 45 moles of hg can be found by multiplying 4.5 by 6.022, 102 which is the number of atoms in 4.5 moles of hg, correctly written in scientific notation with the correct number of significant figures? 0 21,109 0 21,100 271, 1024 27.099, 100 mark this and retum save and exit submit