What is the name of the element with a valence electron configuration of 4s^2

The initial temperature of a 1.00 liter sample of argon is 20 Celsius. The pressure is decreased from 720 mm Hg to 360 mm Hg and the volume increases to 2.14 liters. What is the final temperature of the argon?

The respiratory system is responsible for the exchange of oxygen with what gas? nitrogen hydrogen water vapor carbon dioxide

How many moless is 4.91x10^22 molecules of H3PO4?

Write a balanced chemical equation for each of the following. (A) Solid copper reacts with solid sulfur to form solid copper (I) sulfide. Express your answer as a chemical equation. Identify all of the phases in your answer.

Balance the following reaction. C₂H6 + Cl2 C2H4Cl2 + HCI

Which of the following is an oxidation-reduction reaction? Which of the following is an oxidation-reduction reaction?

Which of the following will have the highest electronegativity? Silicon (Si), Phosphorus (P) or Arsenic (As). Explain your answer

On a 10-fold dilution of a strong acid, the ph will

An atom has the following electron configuration. 1s^2 2s^2 2p^6 3s^2 3p^4 How any valence electrons does this atom have?

What chemical element would you expect to find in amino acids?