Atoms STAAR Test

Elements are arranged in the Periodic Table based on their properties in a particular order. Which of the following correctly identifies the period and group of the elements listed? (8.5C)

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Which of the following tables would be used to correctly describe the difference between metals and non-metals? (6.6A)

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How many valence electrons are in an atom of each element in Group 15 in the periodic table? --8.5C

• 1

• 15

• 5

• 4

Which statement correctly describes the location and charge of the electrons in an atom?

• The electrons are inside the nucleus and have no charge

• The electrons are outside the nucleus and have no charge

• The electrons are inside the nucleus and have a negative charge

• The electrons are outside the nucleus and have a negative charge

An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the atom's nucleus?

• +25

• +30

• -25

• -30

The atomic number of krypton is 36. If the mass number of a krypton atom is 84, which table shows the number of subatomic particles inside and outside the nucleus of the krypton atom?

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Tags

NGSS.MS-PS1-1

What is the total number of protons, neutrons, and electrons in a cadmium, Cd, atom that has a mass number of 112?

• 48

• 64

• 160

• 208

What is the difference between the number of electrons in an atom of selenium, Se, and the number of electrons in an atom on aluminum, Al?

• 34

• 13

• 21

• 47

How many protons, neutrons, and electrons are present in an atom of hafnium, Hf, with a mass number of 178?

• 72 protons, 178 neutrons, 106 electrons

• 72 protons, 106 neutrons, 72 electrons

• 178 protons, 250 neutrons, 72 electrons

• 106 protons, 72 neutrons, 106 electrons

Tags

NGSS.MS-PS1-1

An atom of a certain element has 36 protons, 36 electrons, and a mass number of 84. At room temperature this element is a very stable gas. How many neutrons are in this atom?

Hint: Use APEMAN

• 36

• 48

• 38

• 72

Tags

NGSS.MS-PS1-1