An atom of an element has 28 innermost electrons and 7 outermost electrons. In which period of the Periodic Table is this element located?

1. 5

2. 2

3. 3

4. 4

What is calorimetry

E. coli and elephants. What is meant by the phrase unity of biochemistry? What are the implications of the unity of biochemistry?

What conversion factor would you use to convert correctly from the mass of a given substance to the number of moles of the given substance?

How many valence electrons does Iron (Fe) have? How do you know?

Disproportionation is a process in which a substance

A mixture of two compounds, a and b, was separated by extraction. after the compounds were dried, their masses were found to be: 105 mg of compound a and 91 mg of compound b. both compounds were recrystallized and weighed again.

What are the five types of chemical reactions?

Which chemical reaction do plants use to take carbon dioxide out of the air

What are the primary elements of the earths layres?

How long does it usually take fir a rock to undergo a stage within the rock cycle