Chemistry- SC3-4

What organizes elements in the Periodic Table?

Elements are arranged by increasing atomic number.

What indicates the highest energy level of an atom's electrons in the Periodic Table?

The period number.

What are groups in the Periodic Table?

Vertical columns where elements have similar chemical properties.

What happens to the atomic radius across a period?

It generally decreases.

What is ionization energy?

The energy required to remove the outermost electron.

What charge do protons have?

Protons are positively charged.

Where are neutrons located in an atom?

In the nucleus.

What is the mass of an electron compared to protons and neutrons?

The mass of an electron is approximately 0.0005 amu, which is negligible.

What is the atomic number (Z) of an element?

The number of protons in an atom's nucleus.

What defines isotopes?

Atoms of the same element with different numbers of neutrons.

What type of ion is positively charged?

Cation.

What type of ion is negatively charged?

Anion.

How do you calculate the mass number (A)?

Mass number is the total number of protons and neutrons (A = Z + N).

What is the relative atomic mass of boron with isotopes boron-10 and boron-11?

The relative atomic mass is 10.8.