What is the electron structure of a sodium atom?

A. 1s22s22p63s1

B. 2s22s22p63s1

C. 1s22s22p63s6

D. 1s12s22p63s1

Marcus measured the masses and volumes of samples of four different substances, and he calculated their densities. The table shows Marcus's measured and calculated values. Substance Mass (g) Volume (cm3) Density (g/cm3) aluminum 5.7 2.1 2.

The Suns ultraviolent Rays can cause skin damage including sunburn and even skin

The valence of aluminum is + 3, and the valence of chlorine is - 1. The formula for aluminum chloride is correctly written as A. Al3Cl. B. AlCl3. C. ClAl3. D. Cl3Al.

Type the symbol of the 2nd period. Metalloid

How many joules are needed to warm 675 grams of water (specific heat = 4.186 J/g degrees Celsius) from 12 degrees Celsius to 85 degrees Celsius?

What is the atomic weight of a hypothetical element consisting of two isotopes, one with mass = 64.23 amu (26.0%), and one with mass = 65.32 amu? (a) 65.3 amu (b) 64.4 amu (c) 64.9 amu (d) 65.0 amu (e) 64.8 amu

Is this base a physical or chemical property?

Classify each of the following aqueous solutions as a nonelectrolyte, weak electrolyte, or strong electrolyte. a) LiClO4 b) HClO c) CH3CH2CH2OH d) HClO3 e) CuSO4 f) C12H22O11

Give examples of temporaty physical change

Which of these is a source of sediment? A. Fragments of other rocks B. Chemicals and Minerals dissolve in water C. Sea shells D. All of the above