Gases Answers

Which scientist is known for developing the planetary model of the atom?

What is the atomic number of zirconium?

Which of the following symbols would be included in the noble gas notation for an element that had valence electrons in the 5s subshell?

Which element has 32 protons in its nucleus?

Which statement best describes how electrons fill orbitals in the periodic table?

To show the electron configuration for an atom, when would it be better to use an orbital notation than to use a written configuration with numbers, letters, and superscripts?

Iron, an element with the chemical symbol Fe, is an important element. It is used to make steel and is part of the substance that transports oxygen throughout the human body.Which statement about Fe is supported by the modern atomic theory but not John Dalton’s theory?

Which physical method can be used for obtaining a sample of salt from a small beaker of salt water?

Which is a correct set of values of m for one of the subshells of n = 2?

Air is made up of different gases, such as oxygen, nitrogen, and carbon dioxide. Which statement best describes these three components of air?

Who was the first to propose the existence of atoms?

Hydrogen has three isotopes 1H, 2H, and 3H. What is the difference between these three isotopes?

Which set of numbers gives the correct possible values of l for n = 2?

Which element is the most reactive?

Which of Dalton's ideas about the atom did J.J. Thomson's experiment disprove?

The diagram below shows some subatomic particles.Which of these statements best identifies the particle that is labeled with an X?

A single atom of an element has 11 protons, 11 electrons, and 12 neutrons. Which element is it?

Which characteristic is given by the angular momentum quantum number?

Which substance is a mixture?

How many valence electrons does aluminum (Al) have available for bonding?