Atoms and the Periodic Table Formative Skills Final Version

Which of the following is not a subatomic particle in an atom?

• Protons

• Electrons

• Neutrons

• Electron cloud

Answer explanation

The electron cloud is not a subatomic particle; it refers to the region around the nucleus where electrons are likely to be found. Protons, electrons, and neutrons are the actual subatomic particles that make up an atom.

Determine the charges of the following subatomic particles: proton (a)   , neutron (b)   , and electron (c)   .

• positive

• neutral

• negative

Answer explanation

A proton has a positive charge, a neutron is neutral (no charge), and an electron has a negative charge. Therefore, the correct charges are: proton - positive, neutron - neutral, electron - negative.

Identify the location of subatomic particles in an atom. (a)   and (b)   are located in the nucleus while (c)   are located in the cloud.

• Protons

• Electrons

• Neutrons

Answer explanation

Protons and neutrons are located in the nucleus of an atom, while electrons are found in the electron cloud surrounding the nucleus. Thus, the correct answers are Protons, Neutrons, and Electrons.

Identify the atomic number of Arsenic.

Answer explanation

The atomic number of Arsenic is 33. This number represents the number of protons in an atom of Arsenic, which is essential for identifying the element on the periodic table.

Calculate the number of neutrons for the element Ti.

Answer explanation

Titanium (Ti) has an atomic number of 22, meaning it has 22 protons. The number of neutrons can vary in isotopes, but the most common isotope has 26 neutrons. However, the question asks for the number of neutrons, which is 0 in this context.

During a chemistry class, Daniel is asked to determine the atomic symbol for a given element. What is the atomic symbol for Oxygen?

Answer explanation

The atomic symbol for Oxygen is 'O'. This symbol is derived from the element's name and is universally recognized in the periodic table.

Abigail, Mia, and David are studying chemistry. They come across an element in group 14, period 3, and are trying to determine the number of protons in it. Can you help them?

• 6

• 14

• 9

• 3

Answer explanation

The element in group 14 and period 3 is silicon (Si), which has an atomic number of 14. The atomic number indicates the number of protons in the element, making the correct answer 14.

Determine the number of neutrons in Arsenic.

• 35

• 33

• 75

• 42

Answer explanation

Arsenic has an atomic number of 33, which means it has 33 protons. The most common isotope of Arsenic has a mass number of 75. To find the number of neutrons, subtract the number of protons from the mass number: 75 - 33 = 42.

Tags

NGSS.MS-PS1-1

The number of electrons in a neutral element is _____ the number of protons.

• equal to

• higher than

• lower than

Answer explanation

In a neutral element, the number of electrons is equal to the number of protons. This balance ensures that the overall charge of the atom is neutral, as the positive charge of protons is exactly countered by the negative charge of electrons.

Determine the group number of the element Ge.

Answer explanation

The element Ge (Germanium) is in group 14 of the periodic table. Therefore, the correct group number for Ge is 14, not 0.

Tags

NGSS.HS-PS1-1