Please hel The Periodic Table is arranged by properties:metals (mostly to the of table,) metalloids(along the , and nonmetals) ( mostly to the of table) . It is also arranged by chemical properties, including reactivity. Elements in the same vertical group have the same number of electrons, and elements in the same horizontal period have the same number of shells.

Which supports the idea that birds and butterflies both have wings but they do not have a common ancestor with wings? a. the wings are analogous structures that evolved differently and do not have a similar internal structure. b. the wings are homologous structures that evolved differently and do not have a similar internal structure. c. wings of birds are vestigial structures, but the wing structures of bats are not vestigial. d. wings of bats are vestigial structures, but the wing structures of birds are not vestigial

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false

Given the following equation: 2a1 + 3mgcl2 --> 2alcl3 + 3mg how many moles of aluminum chloride are produced from 2.5 moles of magnesium chloride?