HELPPP ANSWERS Why is Boron's (B) atomic radius smaller than Beryllium (Be)?

A.
Beryllium has a lower electronegativity which makes it smaller.

B.
Boron has more protons and electrons, which causes a greater electromagnetic attraction, bringing the electrons closer to the nuclues.

C.
Beryllium has more protons and electrons, which causes a greater electromagnetic attraction, bringing the electrons closer to the nuclues.

D.
Boron has a lower electonegativity which makes it smaller.

Asample of rose gold is: 12.0 g gold, 5.0g silver, and 7.0 g copper. what is the percent copper in the sample?

Identify one disadvantage to each of the following models of electron configuration: -dot structures -arrow and line diagrams -written electron configurations type in your answer below. (answer) -dot structures do not show the distribution of electrons in orbitals and take up a lot of space. -arrow and line diagrams take up a lot of space and make it difficult to count electrons. -written configurations make it easy to lose count of electrons and do not show the distribution of electrons in orbitals.

Air can be considered a mixture. which statement does not explain why?