NEED HELP! URGENT! WILL MARK BRAINLIEST What is the oxidation number for “O” in ErO₂ ?
A. -6
B. -1
C. -4
D. 4
E. 2
-2
What is the oxidation number for “Er” in ErO₂ ?
A. -4
B. -2
C. +1
D. +2
E. +4

What is the oxidation number for “At” in AtO₃⁻ ?
A. +5
B. +7
C. -2
D. +3
E. -6

What is the oxidation number for “O” in AtO₃⁻ ?
A. -6
B. -4
C. +4
D. -2
E. -3
F. +2

Your roll: experienced electron speech is adressed to: a new "freshman class" of electrons job: write a speech task: you are to pretend that you are giving a speech to a new group of electrons. be sure to mention their placement in an atom, their charge, and their role in chemical bonding (ionic and covalent) be specific!

Achemist wants to extract copper metal from copper chloride solution. the chemist places 0.50 grams of aluminum foil in a solution containing 0.75 grams of copper (ii) chloride. a single replacement reaction takes place. (ii) chloride. a single replacement reaction takes place. which statement explains the maximum amount of copper that the chemist can extract using this reaction? a) approximately 0.36 grams, because copper (ii) chloride acts as a limiting reactant b) approximately 1.8 grams, because copper (ii) chloride acts as a limiting reactant c) approximately 0.36 grams, because aluminum acts as a limiting reactant d) approximately 1.8 grams, because aluminum acts as a limiting reactant

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space