How many electrons are represented by a dash (-) in a lewis dot structure compound? A. 2
B. 4
C.3
D. 1​

Check the correct box to describe the periodic trends in electronegativity. electronegativity across a period: decreases. increases. electronegativity down a group: decreases. increases.

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.