An element M has an atomic number 9 and atomic mass 19 . Its ion will be represented by: (a) M □

step 1 The question is an element M has the atomic number 9 and atomic mass 19. Its ion will be represe

An element M has an atomic number 9 and atomic mass 19 . Its...

Key Concepts

Electron Configuration and Stability

Electron configuration describes the distribution of electrons in an atom’s orbitals. Atoms tend to gain, lose, or share electrons in order to achieve a stable electron configuration, often that of the nearest noble gas. This drive toward stability influences the charge on ions, as elements will usually form ions by gaining or losing the minimum number of electrons required to fill or empty their outermost shell.

Ion Formation

Ions are formed when atoms either lose or gain electrons, resulting in a net electrical charge. Atoms that gain electrons become negatively charged anions, while those that lose electrons become positively charged cations. The formation and charge of an ion depend on the element’s electron configuration and the desire to achieve a stable electron arrangement, often similar to a noble gas configuration.

Atomic Mass

The atomic mass is the weighted average mass of the atoms of an element, taking into account the different isotopes of the element. It is measured in atomic mass units (amu) and provides insight into the relative mass of the element's atoms as compared to others on the periodic table.

Atomic Number

The atomic number of an element is the number of protons in the nucleus of its atoms. This number determines the element’s identity and its position in the periodic table, as well as the number of electrons in a neutral atom, which in turn affects its chemical behavior.

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