Which of the following observations indicates that an atom has neutrons?
a) some uncharged particles are scattered by a beryllium atom when it hits a gold foil.
b) some uncharged particles bounce back from a gold foil when it is bombarded with alpha particles.
c) radiation consisting of uncharged particles is emitted when alpha particles strike beryllium atoms.
d) radiation which attracts electrons is produced when a beryllium atom is bombarded with alpha particles.

If two atoms are bonded to a central atom with no lone pairs,how will they be arranged

Apiece of copper has a temperature of 75.6 0c. when the metal is placed in 100.0 grams of water at 19.1 0c, the temperature rises by 5.5 0c. what is the mass of the metal?

Nitric acid can be formed in two steps from the atmospheric gases nitrogen and oxygen, plus hydrogen prepared by reforming natural gas. in the first step, nitrogen and hydrogen react to form ammonia: (g) (g) (g) in the second step, ammonia and oxygen react to form nitric acid and water: (g) (g) (g) (g) calculate the net change in enthalpy for the formation of one mole of nitric acid from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .