Atoms Unit 1

The illustration below, taken from the periodic table, provides information about the element calcium (Ca).

Where would the element with the atomic number 19 be placed on the periodic table?

• above calcium

• below calcium

• to the left of calcium

• to the right of calcium

The model shows an atom of carbon. Valence electrons are those located on the outer shell of the atom.

How would the outer shell of germanium (Ge) compare to carbon?

• The outer shell of germanium has the same number of valence electrons as carbon.

• The outer shell of germanium has less valence electrons than carbon.

• The outer shell of germanium is variable as it is a transition metal.

• The outer shell of germanium has more valence electrons than carbon.

Tags

NGSS.MS-PS1-1

The teacher shows students a pictorial model of an atom. Which element is represented by the model and what evidence is provided?

• Fluorine because the model has 19 neutrons and electrons which is represented by the atomic number found on the periodic table.

• Fluorine because the model has 9 protons which is represented by the mass number found on the periodic table.

• Fluorine because the model has 9 protons which is represented by the atomic number found on the periodic table.

• Neon because there are 10 neutrons which is represented by the atomic number found on the periodic table.

Tags

NGSS.MS-PS1-1

The folowing is an electron cloud model of an atom, drawn by a student, using information from the periodic table. Each letter represents a different subatomic part or particle.

The student wants to modify his model to create an atom of Neon. What steps should he take?

• step 1: Increase amount of particle N by 4

  step 2: Decrease amount of particle P by 5

  step 3: Increase amount of particle L by 5

• step 1: Decrease amount of particle M by 4

  step 2: Increase amount of particle P by 5

  step 3: Decrease amount of particle L by 4

• Step 1: Decrease amount of particle P by 4

  step 2: Increase amount of particle M by 5

  step 3: Decrease amount of particle L by e

• step 1: Increase amount of particle P by 5

  step 2: Increase amount of particle N by 4

  step 3: Increase amount of particle L by 5

Tags

NGSS.MS-PS1-1

The periodic table provides a model which arranges the elements by their atomic number. Which graph shows the trend in atomic number from left to right across a period?

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Sam's mother is cooking breakfast in a cast-iron frying pan. If the pan is made only of iron, what can Sam conclude?

• The pan is a pure substance with the chemical symbol Fe

• The pan is a pure substance with the chemical symbol F.

• The pan is a pure substance with the chemical symbol Ir.

• The pan is a pure substance with the chemical symbol I.

Tags

NGSS.MS-PS1-1

Select all of the diagrams that show the particles of a heterogeneous mixture.

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Directions: The models Q, R, S, and T below show different kinds of matter. Use the models to answer any questions that follow.

Which model contains a mixture of two compounds?

• Q

• R

• S

• T

A pure substance is made up of one type of particle. The particle can be an element or a compound. The illustration below shows several common household items.

Which of the items in the illustration is a pure substance?

• Water

• Fruit Gelatin

• Salad Dressing

• Milk

Tags

NGSS.MS-PS1-1

Look at the illustratins

Which of illustrations depicts a container filled with a homogenous mixture?

• A

• B

• C

• D