All elements in a period have the same energy level due to which of the following reasons?

a. the same atomic number

b. the same number of neutrons

c. the same number of electrons

d. the same number of electron shells

The elements in alkali metal and halogen groups of the periodic table are the most reactive since they only need to gain or lose one electron to become stable by filling their valence orbital.

Lewis diagram of Ozone

A? Such as tearing paper or melting chocolate does not change the identity of the substance

What is the oxidation number of phosphorus (P) in phosphoric acid (H3PO4) ?

a solution contains 29.1g per litre of aluminium sulphate. calculate the number ofsulphate ions in 350cm^3 of the solution (Al=27, S=32, O=16)

How does the shape of the Earth affect the climate of different regions?

What is Delta. Gsystem for the system that is described by the following data? Delta. Hsystem = - 345 kJ, T = 293 K, Delta. Ssystem = 465 J/K Delta. Gsystem = Delta. Hsystem - TDelta. Ssystem - 481 kJ - 209 kJ 413 kJ 135,900 kJ

Calculate ΔGrxn for this equation, rounding your answer to the nearest whole number. CaCO3 (s) → CaO (s) + CO2 (g) ΔGf, CaCO3 = - 1,128.76 kJ/mol ΔGf, CaO = - 604.17 kJ/mol ΔGf, CO2 = - 394.4 kJ/mol

Using two spring scales, students pull on opposite sides of a dynamic cart at rest. 5 Newtons of force is pulling left and 5 newtons force is pulling right. Describe the motion of the cart? A) The cart will move to the right.

If a mineral has a metallic shine to it, which property of a mineral is being measured