Rows in the periodic table are called (a)  

Columns in the periodic table are called ​ (b)  

• period

• group

Answer explanation

Rows in the periodic table are called periods, while columns are called groups. This terminology helps organize elements based on their properties and trends.

Elements in the periodic table are sorted by:

• Increasing atomic number

• Increasing atomic mass

• Alphabetical order

• Increasing number of valence electrons

Answer explanation

Elements in the periodic table are sorted by increasing atomic number, which represents the number of protons in an atom's nucleus.

Isotopes are atoms of the same element with a different number of:

• Protons

• Electrons

• Valence electrons

• Nucleus

• Neutrons

Answer explanation

If you change the number of protons, you change of elements. Elements in the periodic table are neutral, therefore the number of proton is always equal to the number of electrons.

The atomic mass in the periodic table is

• The atomic mass of the most common isotope

• The averaged atomic mass of isotopes

• The atomic mass of the first discovered atom of the element

• All of the answers

The electrons are the lightest particles in the atom

• True

• False

• They all have the same mass

All the elements in the periodic table are solid at 20°C

• True

• False

Answer explanation

Some are gas (oxygen) and others are liquid (Mercury)

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The group of the element in the periodic table gives us the ​ (a)   .

The period of the element in the periodic table gives us the ​ (b)  

• number of valence electrons

• number of energy levels

• number of protons

• number of electrons

• number of isotopes

Answer explanation

The group of the element in the periodic table gives us the number of valence electrons. The period of the element in the periodic table gives us the number of energy levels.

The family colored in the picture is:

• Alkali metals

• Alkaline Earth Metals

• Transition metals

• Noble gases

• Halogens

Answer explanation

The family colored in the picture is Halogens. Halogens are a group of elements in the periodic table known for their high reactivity and tendency to form salts. They include elements such as fluorine, chlorine, bromine, iodine, and astatine.

The family colored in the picture is:

• Alkali metals

• Transition metals

• Inner transition metals

• Rare metals

What is specific with noble gases:

• They are expensive

• They are stable

• They do not combine with other elements

• They have 8 valence electrons

Answer explanation

Noble gases are stable and do not combine with other elements, making them unique. This property is due to their full outer electron shell.