Which element has the greatest first ionization energy? B

C

Be

Li

Which statement is true about the ionic size of the elements in a group as one moves from bottom to top in that group?

Ionic size decreases from bottom to top within the group.

Ionic size increases from bottom to top within the group.

Ionic size does not vary in any predictable way within the group.

Ionic size stays the same within the group.

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.

Which statement explains why the bonds between non metals tend to be covalent? the bonds are found to be nondirectional they have large differences in electronegativity they have small differences in electronegativity they have ions that produce an electrostatic pull

The arrangement of particles is most ordered in a sample of