Which elements can form acidic compounds? Check all that apply. O sulfur
rubidium
O arsenic
selenium
silicon
xenon
antimony

Answer is: sulfur, arsenic, selenium, silicon  and antimony.

1) Sulfur (S) can form, for example, sulfuric acid (H₂SO₄) or acidic oxide, sulfur(VI) oxide (SO₃).

2) Arsenic (As) can form arsenous acid (H₃AsO₃).

3) Selenium (Se) can form selenic acid (H₂SeO₄).

4) Silicon (Si) can form orthosilicic acid Si(OH)₄ and metasilicic acid SiO(OH)₂.

5) Antimony (Sb) can form antimonic acid, as the hydrate HSb(OH)₆.

A= 1 - characteristics that remain in the common ancestor and the modern organism

2 - characteristics that are new and have been modified from what was found in the common ancestor. Help it helps :)