The total number of bonding electrons in a molecule of formaldehyde (H2CO) is

The electron dot formula for O2 shows

How many unpaired electrons does a ground-state atom of sulfur have?

The general electron configuration for atoms of all elements in Group 5A is

Which of the following elements has the greatest electron affinity (largest positive value)?

How many valence electrons does an oxygen atom have?

Which two of the following electron configurations represent elements that would have similar chemical properties? (1) 1s22s22p4       (2) 1s22s22p5       (3) [Ar]4s23d5       (4) [Ar]4s23d104p5  

The combustion of 0.374 kg of methane CH4 in the presence of excess oxygen produces 0.983 kg of carbon dioxide. What is the percent yield?

What is the percent yield of a reaction if the product recovered is 21.2 g and the theoretical yield is 28.4 g? (

What is the oxidation number of free elements?