Atomic Structures of Elements

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is a nucleus in an atom?

Back

The nucleus is the central part of an atom, containing protons and neutrons, and it holds most of the atom's mass.

Front

What is a valence electron?

Back

Valence electrons are the electrons in the outermost shell of an atom that are involved in chemical bonding.

Front

How do you determine the mass number of an element?

Back

The mass number is the total number of protons and neutrons in the nucleus of an atom.

Front

What is the significance of periods in the periodic table?

Back

Periods indicate the number of electron shells in the atoms of the elements in that row.

Front

What is the difference between atomic number and mass number?

Back

The atomic number is the number of protons, while the mass number is the total number of protons and neutrons.

Front

What element has the highest atomic number among the following: Calcium (Ca), Chlorine (Cl), Cobalt (Co), Copper (Cu)?

Back

Copper (Cu) has the highest atomic number among these elements.

Front

Which element has the least number of main energy levels: Barium (Ba), Beryllium (Be), Bohrium (Bh), Bromine (Br)?

Back

Beryllium (Be) has the least number of main energy levels.

Front

What are main energy levels in the Bohr model?

Back

Main energy levels are the fixed distances from the nucleus where electrons can be found, represented as curved lines in the Bohr model.

Front

What is the relationship between the number of valence electrons and an element's reactivity?

Back

Elements with more valence electrons tend to be more reactive, especially those with 1 or 7 valence electrons.