Atomic Structure Test 8.5AB

Refer to the above image. Which of these is NOT found in the nucleus of an atom?

• Neutrons

• Protons

• Atomic mass

• Electrons

Which of the statements above correctly represents the mass of subatomic particles?

• 1,6,9

• 2,6,8

• 3,4,7,9

• 4,5,6,8

Which statement accurately describes the atoms of a specific element?

• An indium, In, atom contains 115 protons inside the nucleus and 49 neutrons outside the nucleus.

• A scandium, Sc, atom contains 45 electrons outside the nucleus and 21 neutrons inside the nucleus.

• An aluminum, Al, atom contains 27 electrons and 27 protons inside the nucleus.

• A zinc, Zn, atom contains 30 protons inside the nucleus and 30 electrons outside the nucleus.

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

Atoms of which two elements have a combined total of 23 protons?

• Sodium, Na, and Magnesium, Mg

• Boron, B, and Carbon, C

• Copper, Cu, and Zinc, Zn

• None of these

The diagram shows a model of an atom. The model has four different symbols on it. Each symbol represents a different role for one of the particles within the atom.

In this model, which particle determines the reactivity of this atom?

• Particle W

• Particle X

• Particle Y

• Particle Z

A student drew atomic models of four elements.

Based on these drawings, which element is the least reactive?

• Neon, Ne, because it has two energy levels with eight electrons in the second level.

• Chlorine, Cl, because it has three energy levels with seven electrons in the third level.

• Gallium, Ga, because it has four energy levels with three electrons in the fourth level.

• Tin, Sn, because it has five energy levels with four electrons in the fifth level.

A chemist made the table below to record some atomic properties of four elements.

Based on the information in the table, which conclusion about the chemical reactivity of these elements is valid?

• Boron, B, is the most reactive because it has the most protons.

• Fluorine, F, is the most reactive because it has 7 electrons in the outer shell.

• Silicon, Si, is the most reactive because it has an equal number of protons and neutrons.

• Gallium, Ga, is the most reactive because it has many more neutrons than protons.

Four students were asked to name the parts of an atom that determine the atom's identity and chemical properties. The students' responses are shown in the table below.

Which student's responses are correct?

• Student 1

• Student 2

• Student 3

• Student 4

According to the Periodic Table, which of the following is the most accurate model of an atom of Boron, B ?

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