Nora is studying transition elements. She notes that they have high melting points, high density, and form colored compounds. Which of the following is a characteristic property of transition elements?

Waseem is learning about the position of an unknown element in the periodic table. He predicts that an element with atomic number 19 will be in which period and group?

Which of the following is a metalloid?

Non-metals usually form:

Julia is studying electronegativity. She knows it is the ability of an atom to attract electrons in a chemical bond. As we move across a period from left to right, electronegativity generally:

Which property is common in metals?

Khalid is comparing the metallic character of elements. He knows that metallic character decreases across a period. Which element in the third period is the most metallic?

Zara is studying the density of halogens. She notes that the density of halogens increases down the group. At room temperature, chlorine is a gas, bromine is a liquid, and iodine is a solid. What is the state of fluorine at room temperature?

Which element shows properties of both metals and non-metals?

Victor is studying the melting points of metals and non-metals. He notes that most metals have high melting points, while non-metals have lower melting points. Which of the following has a high melting point?