#1: which element has the same number of energy levels as bromine (br) and the same number of valence electrons as barium (ba)?
a. potassium (k)
b,. beryllium (be)
c. cadmium (cd)
d. calcium (ca)

The peak wavelength for the blackbody curve of a star is in the uv range. assuming the radiation from this star can reach earth, would you be able to see it?

What happens to the atomic radius when an elctron is lost

Write the formula for the following chemicals. 7. e. trinitrogen tetraoxide a calcium phosphate f. magnesium acetate b. potassium sulfide g nickel(iii) cyanide c carbon dioxide h. silver sulfate d. cobalt(ii) chloride