another who am I? I an in the same chemical family as nitrogen. I am lighter than argon
You need another teacher. Lighter is NOT a physical property. Nitrogen is the only gas in group 15, and it has a density less than Argon.
Based on the information provided, you are likely referring to oxygen, which is in the same chemical family as nitrogen (both are in Group 15 of the periodic table, also known as the pnictogens) and is lighter than argon. To determine this, we can follow a step-by-step process:
1. Identify the chemical family of nitrogen: Start by looking up the position of nitrogen on the periodic table. Nitrogen is located in Group 15, also known as the pnictogens.
2. Find other elements in the same chemical family: To determine which elements belong to the same group as nitrogen, simply look at the other elements in Group 15. In this case, the other elements in Group 15 are phosphorus, arsenic, antimony, and bismuth.
3. Identify the element that is lighter than argon: Compare the atomic masses of the elements in Group 15 with the atomic mass of argon, which is approximately 40 atomic mass units. Nitrogen has an atomic mass of approximately 14, which is considerably lighter than argon. Oxygen, however, has an atomic mass of approximately 16, which is still lighter than argon but closer in weight.
Therefore, based on these criteria, the element that matches the given description (being in the same chemical family as nitrogen and lighter than argon) is oxygen.