Chemistry Notes 1 and 2

1. Which is true regarding subatomic particles?

• Neutrons have double the mass of protons.
• Protons have a positive charge and electrons have a negative charge.
• Both protons and neutrons have a neutral charge.
• Electrons and neutrons have about the same mass and the same charge.

2. Which best describes electrons within an atom?

• Electrons are located within the nucleus and have a mass of 1 atomic mass unit.
• Electrons are located between the protons and neutrons and have a mass that is approximately double that of a proton.
• Electrons have a mass of 2 atomic mass units and surround each individual proton within an atom.
• Electrons have very little mass and are located within the cloud that surrounds the nucleus of an atom.

3. Which would be true when comparing protons and neutrons within an atom?

• Both have the same charge with very different masses.
• Protons have a negative charge and neutrons have a positive charge.
• Both have similar masses but different charges.
• Both protons and neutrons are located in a cloud that surrounds the electrons.

4. An atom has 29 protons, 35 neutrons, and 29 electrons. Which would be true based on this information?

• The atomic mass of the atom is 35 amu.
• The atomic number of the atom is 29.
• The overall charge of the atom is negative.
• The atomic number of the atom is 35.

Tags

NGSS.MS-PS1-1

5. Which element is the least massive in period 3?

• Scandium
• Argon
• Hydrogen
• Sodium

6. Which element has an atomic number of 6?

• Carbon
• Lithium
• Hydrogen
• Helium

7. Which best describes most atoms of Nitrogen?

• Nitrogen has 7 protons and 7 neutrons with an atomic mass of 14 amu.
• Nitrogen has 14 protons and 7 neutrons with an atomic number of 14.
• Nitrogen has double the amount of protons than neutrons.
• Nitrogen has 14 electrons in its electron cloud when neutral.

Tags

NGSS.MS-PS1-1

8. A student is examining a piece of a chlorine tablet that she is about to put in a pool filter. Which best describes this material?

• The atoms have an atomic number of 35, with 35 protons and 35 neutrons.
• The atoms have double amount of protons than neutrons within most of the atoms.
• Most of the atoms have 35 electrons within the electron cloud surrounding the nucleus.
• Most of the atoms have 17 protons and 18 neutrons within the nucleus.

Tags

NGSS.MS-PS1-1

9. Which of the following would most accurately allow you to identify a specific element on the periodic table?

• knowing the group number
• knowing the atomic number
• knowing the period number
• knowing what other atoms it tends to bond with

10. As you move down a group on the periodic table ...

• the proton number increases for each element.
• the neutron number decreases for each element.
• the number of electrons decreases (if neutral) for each element.
• the number of neutrons remains the same for each element.