In which numbered position would a Period 4 element that is a metal with three valence electrons be located? A) Position 13
B) Position 15
C) Position 20
D) Position 31

Flourine is found to undergo 10% radioactivity decay in 366 minutes determine its halflife

Acalorimeter is to be calibrated: 51.203 g of water at 55.2 degree c is added to a calorimeter containing 49.783 g of water at 23.5c. after stirring and waiting for the system to equilibrate, the final temperature reached is 37.6 degree c. specific heat capacity of water (s = 4.18 j/g∙degree c). calculate the calorimeter constant. (smδt)warm water = -[(smδt)cold water + (calorimeterδtcold water)]

Draw the lewis structure for the trisulfur s3 molecule. be sure to include all resonance structures that satisfy the octet rule.