now using your periodic table as a reference type the symbols for the known elements into the appropriate groups and periods in a modified table below note that were using the international group numbers one through 18 followed by the American scheme for the a group elements in parentheses

Which of the following is a conclusion that resulted from ernest rutherford’s scattering experiment? (will mark brainliest) a. the nucleus is negatively charged b. the atom is a dense solid and is indivisible c. the mass is conserved when atoms react chemically d. the nucleus is very small and the atom is mostly empty space

The vapor pressure of ethanol is 1.00 × 102 mmhg at 34.90°c. what is its vapor pressure at 61.61°c? (δhvap for ethanol is 39.3 kj/mol.)

Why is the bottom layer of a trophic pyrimid the