1st and 2nd group of atomic numbers.
Understand the Problem
The question is asking about the first and second groups of the periodic table, which relate to the elements corresponding to atomic numbers in those groups. A high-level approach would be to provide information about the elements in these groups and their properties.
Answer
Group 1: 1(H)*, 3, 11, 19, 37, 55, 87. Group 2: 4, 12, 20, 38, 56, 88.
The first group in the periodic table is the alkali metals (excluding hydrogen), containing elements with atomic numbers such as 1 (hydrogen, typically grouped separately), 3 (lithium), 11 (sodium), 19 (potassium), 37 (rubidium), 55 (cesium), and 87 (francium). The second group is the alkaline earth metals, with elements having atomic numbers 4 (beryllium), 12 (magnesium), 20 (calcium), 38 (strontium), 56 (barium), and 88 (radium).
Answer for screen readers
The first group in the periodic table is the alkali metals (excluding hydrogen), containing elements with atomic numbers such as 1 (hydrogen, typically grouped separately), 3 (lithium), 11 (sodium), 19 (potassium), 37 (rubidium), 55 (cesium), and 87 (francium). The second group is the alkaline earth metals, with elements having atomic numbers 4 (beryllium), 12 (magnesium), 20 (calcium), 38 (strontium), 56 (barium), and 88 (radium).
More Information
In the periodic table, elements are grouped based on similar properties. Group 1 contains alkali metals which are highly reactive, especially with water. Group 2 contains alkaline earth metals known for being less reactive than Group 1 and often forming ions with a +2 charge.
Tips
A common mistake is to group hydrogen with alkali metals due to its position. However, hydrogen often behaves differently and is sometimes set apart.
Sources
- Atomic Mass | Periodic Table of Elements - PubChem - pubchem.ncbi.nlm.nih.gov
- Group (periodic table) - Wikipedia - en.wikipedia.org
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