Question

1. practice: turn off show electron dot diagram. use the gizmo to create a neutral atom of each of the following elements. correct the electron dot diagram for elements in the box double clicking the box to edit. h. he. ·li ·be ·si ·b. ·c. ·n ·mg ·al ·o. f ·ne ·na 6. extend your thinking: many chemical properties are determined by the number of valence electrons. elements with the same number of valence electrons will have similar properties. which element has similar properties to lithium? ______ beryllium? ____ explain: ______

Explanation:

Step1: Recall valence - electron concept

Valence electrons determine chemical properties. Elements in the same group have the same number of valence electrons.

Step2: Find group of lithium

Lithium (Li) is in Group 1 of the periodic table. It has 1 valence electron. Sodium (Na) is also in Group 1 and has 1 valence electron, so it has similar properties to lithium.

Step3: Find group of beryllium

Beryllium (Be) is in Group 2 of the periodic table. It has 2 valence electrons. Magnesium (Mg) is also in Group 2 and has 2 valence electrons, so it has similar properties to beryllium.

Elements in the same group have the same number of valence electrons and thus similar chemical properties. Lithium and sodium are in Group 1 with 1 valence electron each. Beryllium and magnesium are in Group 2 with 2 valence electrons each.

Answer:

Lithium: Sodium
Beryllium: Magnesium