Why is helium considered as a noble gas

A rocky island appears as oceanic waters recede. Which of the following forms of vegetation would probably appear first on the bare rocks?

Take a look at group 7A on the periodic table (Halogens). Which of the following statements is true regarding fluorine and iodine?

What mass of K2SO4 What do you need to prepare 1200 g of an 8% K2SO4 m/m solution

1. A change in temperature is always an indicator of a chemical reaction. True or False? 2. A color change is an indicator of a chemical reaction. True or False? 3. A change in size is an indicator of a chemical reaction. True or False? 4.

John dalton proposed a theory that all matter is made up of individuals particles which cannot be divided. what were those particles?

How do carbon-12 and carbon-13 differ? Select all that apply. They have different amounts of neutrons. They have different atomic charges. They have different mass numbers. They have different amounts of electrons.

Why arent the jaguars and sloths growing and thriving?

If a spoon is hot after leaving it on the pot that was on the stove. What heat transfer is that.

If a small amount of ferrous ammonium sulfate is spilled when transferring

List one reason as to why historical growth has slowed in recent years.