Matter and Energy Review Day 1

Matter and Energy Review Day 1

Multiple Choice

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

• The electrons are inside the nucleus and have not 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.

Multiple Choice

A model of a beryllium atom is shown. What type of particles are found in the cloud surrounding the atom's nucleus?

• Positively charged particles and negatively chared particles

• Negatively charged particles only

• Neutral particles and positively charged particles

• Positively charged particles only

Multiple Choice

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

Multiple Choice

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

Multiple Choice

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

Multiple Choice

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

Multiple Choice

A student drew atomic models of four elements. Based on these drawings, which element is the least reactive?

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

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

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

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

Multiple Choice

A chemist made the table 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 is the most reactive because it has the most protons

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

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

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