An element has atomic number 10 and an atomic mass of 20. How many neutrons are in the atom of this element?

Ο Α. 10

Ο Ο

Oc. 30

OD. O

ΟΕ. 200

What is the chemical formula for the compound formed between sodium and iodine?

Dams affect animals ecosystems a decrease in the fish population which in turn decrease other animal population who depend on fish as a food sources True or False

How is diffusion used by cells? (Missed this lesson in school)

1. Convert 0.00006125 to scientific notation

What will happen wen lead react with copper 2 sulfate

What is the molar mass of the following substance : Cs2CO3

What does the velocity of a wave describe

Sulfur (S) has 16 protons and 16 neutrons. How many electron shells does an element of sulfur have?

Which one of the following statements about orbital energies is incorrect? A) The energy of a given orbital increases as the nuclear charge Z increases. B) In many-electron atoms the energy of an orbital depends on both n and l.

When solid lead (II) sulfide ore burns in oxygen gas, the products are solid lead (II) oxide and sulfur dioxide gas.? A. write the balanced equation B. how many grams of oxygen are required to react with 29.9 grams of lead II sulfide? C.