Chemistry Ions and Elements

The cations of group 1A elements always have a charge of ___________.

+1

Among Group 1A and 2A elements, the group number is equal to the number of valence electrons in an atom of that element. AT~ST~NT

AT

The chemical properties of an element are largely determined by the # of valance electrons the element has. AT~ST~NT

AT

The transfer of valence electrons produces positively charged ions, or ________, and negatively charged ions called _______.

Cations Anions

For transitions metals, the ____ of cations may vary.

Charges

The _______ number of a representative element indicates how many valence electrons that element has.

Group

______ are produced when atoms of the elements in Group 7A _______ an electron.

Halide Ions Gain

An atom of an element in Group 1A has seven valence electrons. AT~ST~NT

NT

Sulfur and magnesium both have 2 valence electrons. AT~ST~NT

NT

The chlorine atom gains seven electrons when it becomes an ion. AT~ST~NT

NT

Gilbert Lewis's ________ states that in forming compounds, atoms tend to achieve the electron configuration of a noble gas.

Octet Rule

Atoms acquire the stable electron structure of a noble gas by losing electrons. AT~ST~NT

ST

Elements within the same group of the periodic table behave similarly because they have the same number of __________

Covalence Electrons

Diagrams that show valence electrons as dots are called ______.

Lewis Dot Structure