Atomic Structure and Periodic Table Unit Review

Front

Nucleus particles

Back

Protons and neutrons

Answer explanation

The nucleus of an atom is made up of protons and neutrons. Electrons are found in the electron cloud surrounding the nucleus, not within it. Therefore, the correct answer is protons and neutrons.

Front

Mass number: 10, Atomic number: 6

Back

Protons: 6

Answer explanation

The atomic number of an element indicates the number of protons it has. Since the element has an atomic number of 6, it has 6 protons. Therefore, the correct answer is 6.

Front

Electrons in Silicon (Si)

Back

14

Answer explanation

Silicon (Si) has an atomic number of 14, which means it contains 14 electrons. This is because the number of electrons in a neutral atom is equal to its atomic number.

Front

Shiny elements that conduct electricity and heat

Back

Metal

Answer explanation

Elements that are shiny, conduct electricity, and heat are classified as metals. Nonmetals and metalloids do not share all these properties, making 'metal' the correct choice.

Front

Group 18 elements

Back

noble gases

Answer explanation

Group 18 elements are known as noble gases because they have full valence shells, making them stable and unreactive. This distinguishes them from other groups in the periodic table.

Front

Silver (Ag) - Period 5, Group 11

Back

Element classification

Answer explanation

Silver (Ag) is located in Period 5 and Group 11 of the periodic table. This classification is based on its electron configuration and position among transition metals, making 'Period 5, Group 11' the correct answer.

Front

Similar chemical properties

Back

K and Na

Answer explanation

K (potassium) and Na (sodium) are both alkali metals in Group 1 of the periodic table, sharing similar chemical properties such as reactivity and electron configuration. The other pairs have different groups and properties.

Front

Element's identity

Back

Determined by protons

Answer explanation

An element's identity is determined by the number of protons in its nucleus. Protons define the atomic number, which uniquely identifies the element, while electrons and neutrons can vary without changing the element's identity.

Front

Rows: periods, Columns: groups

Back

Periodic Table Structure

Answer explanation

In the periodic table, rows are called periods and columns are called groups. Therefore, the correct answer is 'periods, groups'.

Front

Central region of an atom

Back

Nucleus

Answer explanation

The central region of an atom, where neutrons and protons are located, is called the nucleus. This is the core part of the atom, distinguishing it from the electron cloud surrounding it.