Which element burn with a characteristics of green flame
please cleet all that apply

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh

Acamcorder has a power rating of 17 watts. if the output voltage from its battery is 7 volts, what current does it use?units: