Which property of an atom describe the reason it is placed in period 2 of the periodic table

A filament at which temperature would have the most light absorbed by a piece of yellow glass?

When aluminum is placed in concentrated hydrochloric acid hydrogen gas is produced. what mass?

Each minerals has it own properties from every othe mineral

How do you crystallize potassium nitrate from it's aqueous solution?

Give the number of significant figures 7.110g

Compared to a potassium atom, a potassium ion has A) a smaller radius B) a larger radius C) fewer protons D) more protons

Which unit measures mass?

The mechanism for the reaction described by 2N2O5 (g) - - - > 4NO2 (g) + O2 (g) is suggested to be (1) N2O5 (g) (k1) - - - > (K-1) NO2 (g) + NO3 (g) (2) NO2 (g) + NO3 (g) - - - > (K2) NO2 (g) + O2 (g) + NO (g) (3) NO (g) + N2O5 (g) - - - > (K3) 3NO2

Which question can be answered using the scientific method? A) Which dog food is best for healthy teeth? B) What color is the most attractive? C) What is my purpose in life? D) Which flower smells the best?

For the galvanic cell reaction, expressed below using shorthand notation, what half-reaction occurs at the cathode?