Question

4 multiple choice 5 points if an element has a pel of 7 and 7 valence e-, what element is it? co bh ts ra

Explanation:

Step1: Recall the periodic table structure

The period number (PEL - principal energy level) indicates the row in the periodic table. Elements with 7 valence electrons are in group 17 (halogens).

Step2: Analyze each option

• Co (Cobalt): It is in group 9 and period 4. Valence electrons are not 7.
• Bh (Bohrium): It is a transition metal in group 7 and period 7. Valence electrons are not 7.
• Ts (Tennessine): It is in group 17 and period 7. Has 7 valence electrons.
• Ra (Radium): It is in group 2 and period 7. Valence electrons are not 7.

Answer:

Ts