4. Atoms and Elements

Which element has the longest official IUPAC element name?

Which element has 23 electrons in a neutral atom?

Which of the following is a valid two-letter element symbol from the periodic table?

Which element has 15 protons in its nucleus?

Give the symbol of the element described by each of the following: a. the alkaline earth metal in Period 2

Which of the following is a valid two-letter element symbol from the periodic table?

Which of the following is a valid two-letter chemical symbol for an element on the periodic table?

On the periodic table, which element has the symbol $T$?

Which element has 24 protons in its nucleus?

Which element has $53$ protons (atomic number $53$)?

Periodic Table: Element Symbols — Which element is a major component of chlorophyll at the center of its porphyrin ring?

Which element makes up most of Earth's atmosphere?

How many protons are in a neutral atom of tellurium (Te)?

Which element has more protons: tin or iodine?

Which element has 56 protons in its nucleus?