The Periodic Table, Molecules and Molecular Compounds, and Ions and Ionic Compounds (Sections)For each of the following elements, write its chemical symbol, locate it in the periodic table, give its atomic number, and indicate whether it is a metal, metalloid, or non-metal: (a) chromium, (b) helium, (c) phosphorus, (d) zinc, (e) magnesium, (f) bromine, (g) arsenic.
Chemistry 1331- 12pm MWF SEC 100 Professor Thomas Teets Units and Significant Figures 01-20-2016 Units: required to make a measurement have meaning; ALL MEASURED QUANTITES NEED UNITS SI Units to Know: Mass Kilogram (kg) Length Meter (m) Time Seconds (s) Temperature Kelvin (K) *NO degree symbol* Amount of substance Mole (mol) Prefixes to Know: Table R-2 in Textbook When these prefixes are added to units, it changes the size of that unit by the given amount (in multiples of 10 ) Mega (M) 10 6 Kilo (k) 10 3 2 Hecto (h) 10 Deka (da) 10 --------Baseline 1--------- (no prefix) --------Baseline 1--------- Deci (d) 10 -1 -2 Centi ( c) 10 -3 Milli (m) 10 Micro (µ -pronounced “mu”) 10 -6 Nano (n) 10 -9 3 Example: meter kilometer = 10 (1000) meters Uncertainty in Measurement: All measurements have some degree of uncertainty Certain digits: digits not estimated
