One mole of magnesium (6 × 1023 atoms) has a mass of 24 grams, and its density is 1.74 grams per cubic centimeter, so the center-to-center distance between atoms is 2.84 × 10-10 m. You have a long thin bar of magnesium, 2.8 m long, with a square cross section, 0.09 cm on a side. You hang the rod vertically and attach a 102 kg mass to the bottom, and you observe that the bar becomes 8.64 cm longer. From these measurements, it is possible to determine the stiffness of one interatomic bond in magnesium. 1) What is the spring stiffness of the entire wire, considered as a single macroscopic (large scale), very stiff spring?

the tides are influenced by both the moon and the sun, it's easy to see that when the sun lines up with the moon and the earth, as during a new moon or full moon, the tidal effect is increased. these are known as spring tides, named not for the season, but for the fact that the water "springs" higher than normal. on the other hand, if the sun and the moon are 90 degrees apart in relation to an observer on earth as during the first quarter moon or third quarter moon, then high tides are not as high as they normally would be. this is because despite its greater distance, the sun's mass allows it to exert enough gravitational force on the oceans that it can negate some of the effects of the moon's pull. this phenomenon of lower high tides is called a neap tide. if you need more information on this topic visit moonconnection.com.

"the periodic table is arranged in order of atomic number."

c. 75.7

i think that is the right

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

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~ trueboss72