Science 9 chapter 4 #15-29

Which of the following provides the best analogy for an electron in an atomic orbital?

An ant crawling on the surface of a leaf

Which statement about electrons and atomic orbitals is not true?

An electron cloud represents all the orbitals in an atom

Which statement about subatomic particles is true

An electron has far less mass than either a proton or neutron

The number of protons in one atom of an element is that element's

Atomic number

To find the number of neutrons in an atom, you would subtract

Atomic number from mass number

Which statement accurately represents the arrangement of electrons in Bohr's atomic model?

Electrons travel around the nucleus in fixed energy levels with energies that very from level to level

How was Bohr's atomic model similar to Rutherford's model?

It described a nucleus surrounded by a large volume of space

The glowing of a neon light is caused by electrons emitting energy as they

Move from higher to lower energy levels

What is the difference between an atom in the ground state and an atom in an excited state?

The atom in an excited state has more energy and is less stable than the atom in the ground state.

In Niels Bohr's model of an atom, electrons move

The electron has gained energy

What can you assume has happened if an electron moves to a higher energy level?

The electron has gained energy

What does the electron cloud model describe?

The most likely locations of electrons in atoms

Which of the following is unique for any given element

The number of protons

Suppose an atom has a mass number of 23 which statement is true beyond any doubt?

The number of protons in the nucleus does not equal the number of neutrons

Which statement is true about oxygen-17 and oxygen-18

They are isotopes of oxygen