An atom that has a closed shell of valence electrons is A
unlikely to form bonds with other atoms.
B
likely to form bonds with other atoms.
C
unlikely to have an atomic number.
D
likely to have unstable isotopes.

muscle endurance

explanation:

i can do 50 in a row ( but i get so tired after that)

kepler used the data from tycho blahe (his mentor) to construct the laws of planetary motion.

wavelegth as in spectrum red oygbiv

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me