What are the symbol name and atomic number of the element


Question 1:  Atoms of two adjacent elements in the third period are in the ground state. An atom of element A has only s electrons in its valence shell. An atom of element B has at least one p electron in its valence shell. Identify elements A and B.

Question 2: What are the symbol, name, and atomic number of the element that has 21 protons in the nuclei of its atoms?

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Chemistry: What are the symbol name and atomic number of the element
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