PS_08_Unit 2 CA Questions

Use the periodic table to answer the question. Which of the following are metals? Choose two correct answers.

• Ra

• Ne

• Li

• Kr

• I

Which of the following best represents our current understanding of atomic structure?

• The Nuclear Model

• The Bohr Model

• The Solid Sphere Model

• The Electron Cloud Model

Why do elements in the same group on the periodic table share many physical and chemical properties?

• They have the same atomic mass.

• When combined with oxygen and hydrogen, they always give off water vapor.

• They contain the same number of electrons in their outer energy level.

• They have the same boiling point.

Based on this picture, which of the following is true?

• Atoms and their isotopes have the same mass.

• Carbon-12 represents the atom and Carbon-13 and Carbon-14 are isotopes.

• Whether an atom is an isotope depends on the number of protons in its nucleus.

• Carbon-12 is heavier than Carbon-13 and Carbon-14.

Tags

NGSS.MS-PS1-1

Which of the following are true about atoms? Choose the correct 3 answers.

• Matter consists of atoms held together by electromagnetic forces.

• Atoms are the basic building blocks of matter.

• Atoms are made up of protons, electrons, and ions.

• Matter exists as different substances which can be used based on their properties.

• Atomic mass is the same as an element’s atomic number.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Which model is widely accepted as the most accurate model of the atom?

• Solid Sphere Model

• Nuclear Model

• Electron Cloud Model

• Bohr Model

Tags

NGSS.MS-PS1-1

What is a limitation of the Nuclear Model?

• Did not recognize that elements are composed of subatomic particles

• Did not explain why electrons orbit the nucleus

• Electrons move in waves

• Atoms are indivisible

What realization did the Electron Cloud Model bring about electron movement?

• Electrons move in set paths

• Electrons do not move in set paths but in waves

• Electrons are stationary

• Electrons orbit the nucleus

What does the graphic illustrate about the development of atomic theory?

• Scientific laws cannot be broken

• The most accepted models change as new information becomes available

• Theories are based on mathematical statements

• Scientific hypotheses are always true

Tags

NGSS.MS-PS1-1

Which of the following are true about protons? Choose 2 correct answers.

• All atoms of an element contain the same number of protons.

• Protons are found in a cloud around the nucleus.

• The number of protons easily changes.

• Atoms frequently give or share protons with one another.

• The atomic number of an element is defined by the number of protons.