List these atoms in order of decreasing electronegativity: Cu, Cl, K

What semimetal can form four single covalent bonds.

Ineed ! it’s science and it’s due tomorrow!

A100-watt light bulb radiates energy at a rate of 100 j/s. (the watt, a unit of power or energy over time, is defined as 1 j/s.) if all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?