How many neutrons does element x have it it’s atomic number is 20 and it’s mass is 88?

Which element in the third period would you expect to have the larger atomic radius, sodium (na) or sulfur (s)? a. sodium, because it has a higher effective nuclear charge attracting electrons in fewer energy levels. b. sodium, because it has fewer protons attracting electrons in the same energy levels. c. sulfur, because it has more protons attracting electrons in more energy levels. d. sulfur, because it has a higher effective nuclear charge attracting electrons in the same energy levels.

Describe the chemical reaction based on the chemical equation below. also, explain whether the equation is balanced.

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?