If an isotope of oxygen (O) has 1 less neutron, how many electrons does it have?

and

If an isotope of sodium (Na) has 2 extra neutrons, what is it's atomic weight?

Which statement best describes a physical change

Give reason milk is a liquid

How many grams of co2 is produced when oxygen reacts with carbon?

Aluminium oxide is used as a catalyst to speed up the reaction. Suggest another reason for using a catalyst. ?

How can chemical weathering make it easier for mechanical weathering to occur? MY EXAMS!

Name 3 characteristics that can be used to identify minerals

Hemoglobin, the oxygen-carrying protein in red blood cells, has four iron atoms per molecules ad contains 0.340 percent iron by mass. calculate the molar mass of hemoglobin

Nancy wants to find out how the steepness of a hill's slope affects the amount of soil that erodes from it. She has soil, a long pan, and a pile of books with which to build a model hillside. She has a watering can to model rainfall.

Elements on the periodic table are arranged by increasing?

What is the difference between molecular formula and molecular model