What does an atomic number represent in an atom? 1. Number of protons 2. Number of electrons. 3. Number of neutrons. 4. Number of protrond and neutrons

When you live in a cold place and you're planning a vacation for February, are you interested in a location's weather or climate? Why?

The mole concept will most likely be used in calculating the average height of a mountain range. measuring how many liters of gasoline are poured into a tank. determining how many ozone molecules are lost in the atmosphere.

How to do electronic configuration

A neutral lithium (Li) atom has an atomic number of 3 and a mass number of 7. How many neutrons are in this atom of lithium?

A chemical supply company sells sulfuric acid (H2SO4) in a concentration of 4.00 M. What volume of this solution would you need to make 12.0 mL of a 0.50 M H2SO4 solution? what is the volume needed?

What is pH? a. The negative logarithm of the hydrogen ion concentration b. The positives logarithm of the hydrogen ion concentration c. The negative logarithm of the hydroxide ion concentration d.

What elements do not contain any neutrons

A) What are the postulates of Bohr's model of an atom? (b) Show diagrammatically the electron distributions in Sodium, Lithium and Aluminium atoms

How many liters of air are in a room that measures 10.0 ft * 11.0 ft and has an 8.00 ft ceiling? 1 in. = 2.54 cm (exactly); 1 L = 103 cm3

Which of these represents a chemical change? A) two compounds combining to form a mixture B) a mixture being separated into two elements C) a compound being separated into two elements D) an element changing state from solid to liquid