2. Atoms & Elements

Which of the following substances did Antoine Lavoisier correctly characterize as an element?

Which feature of Mendeleev's periodic table was considered particularly ingenious?

Which of the following best explains how elements are arranged on the modern periodic table?

How does the periodic table organize elements with similar chemical properties?

How are elements in the periodic table primarily arranged?

Who is credited with creating the first periodic table?

Approximately how many naturally occurring elements are there on Earth?

Is the current representation of the periodic table of elements considered perfect?

Which classification best describes the element calcium (Ca) in the fourth period of the periodic table?

Which of the following elements is likely to be the most brittle?

Who arranged the periodic table in order of increasing atomic number?

What do the elements lithium (Li), sodium (Na), potassium (K), and rubidium (Rb) have in common?

In which block of the periodic table is uranium (U) found?

How are elements arranged on the modern periodic table?

Which of the following elements is classified as a metalloid?