In a periodic table, a set of properties repeats from:
a)element to element
b)group to group
c)column to column
d) row to row

Why should the scientific method be used to answer a question? a. it provides a way to test an idea without any bias. b. it provides a way to test a hypothesis. c. it provides a way to ensure all hypotheses are proven correct. d. it provides a way to quickly turn a hypothesis into a scientific theory.

Find the mass, in grams, of 5.00*10^23 molecules of f2

What type of radiation is lead emitting in the following equation? alpha particles beta particles gamma rays