How many neutrons does element X have if its atomic number is 25 and its mass number is 72?

What are the characteristics of Archaebacteria? A. they are single cells that have a nucleus and tend to live in extreme conditions. B. they are single cells that lack a nucleus and tend to live in extreme conditions. C.

EX: The periodic table is arranged in order of increasing from left to right, and elements in the same column have the same number of EV. ri.

Which of the following pairs of elements are likely to form ionic compounds? Check all that apply. sodium and potassium nitrogen and iodine potassium and sulfur chlorine and bromine helium and oxygen magnesium and chlorine

Classify the substances as atomic elements, molecular elements, molecular compounds, or ionic compounds. a. Agb. Cdc. MgCl2d. F2f. HIg. NO2h. NaCli. Cl2

Describe how to make a buffer solution using a strong base and one other reagent.

Two children are playing tag. Child A who is doing the chasing can run 100m in 24 seconds Child B is running away from child A and can run 64m in 21 seconds.

What ion does a base increase

What is the definition of Amplitude?

An excess of NiCO3, 12 g, was added to 40cm cube of sulpheric acid, 2.0 mol/dm cube. The unreacted nickel carbonate was filtered out and the filtrate evaporated to optain the crystals.

Under what condition is decompostion the fastest? Under what condition is it the slowest?