Question

1 Which elements had complete outer shells? Give the name and symbol for each

Answer 1

Explanation:

1.Which elements had complete outer shells? Give the name and symbol for each

• The elements with outer complete shells are the noble gases or inert gases or Group O elements.
• They are said to have a completer octet.

The elements in this group are:

1. Helium     He
2. Neon          Ne
3. Argon          Ar
4. Krypton       Kr
5. Xenon         Xe
6. Radon          Rn

2. What do you notice about the location of the elements in #1?

The elements here are located in the last group on the periodic table and it is the p-block.

3. Which elements had only one valence electron?

The alkali metals have only one electron in their outermost shell. They are located in the first group on the periodic table. This group is made up of metals.

4. What do you notice about the location of the elements in #3?

They are located in the first group on the periodic table and they have one valence electron

5. What do you notice about the number of valence electrons as you move from left to right across a  row or period in the periodic table? (Na - Mg - Al Si P S - CI - An

The number of valence electrons increases from left to right on the periodic table. Moving across a period is like going from one group to another and the number of valence electrons increases in that manner.

6. What do you notice about the number of energy levels or shells as you move down a group or  column in the periodic table? (H Li - Na)

The energy levels increases. As one goes down a group the atomic radii increases as new energy levels and electronic shells are added to corresponding atoms.

7. Elements are organized into families according to their physical and chemical properties. Identify the  elements that you used in Step 5 that belong to each family based on the number of valence  electrons. Give the name and symbol for each element,

  Group 1 or family 1 elements:

                Lithium           Li

                Sodium          Na

                Potassium       K

                Rubidium        Rb

                 Cesium          Cs

                Francium         Fr

All of the elements in this group have similar chemical and physical properties. They all have one electron in their valence shell.

Alkali Metals - 1 valence electron

Alkaline Earth Metals - 2 valence electrons

Boron Family - 3 valence electrons

Carbon Family 4 valence electrons

Nitrogen Family - 5 valence electrons

Oxygen Family - 6 valence electrons

Halides - 7 valence electrons

Noble Gases - Complete outermost shell

8. What do you notice about the location of the elements in each family?

The location of each element in the family is based on the atomic numbers. This is the number of protons an atom contains.

Each element is arranged in vertical columns and they all have the same number of valence electrons.

9. How would you classify hydrogen? Why?

I will classify hydrogen as a Group O element.

Hydrogen has just one electron. This electron is located in the 1s orbital and half-filled orbitals are also stable like fully filled orbitals.

Also, hydrogen is a gas and it cannot be put into a group of metals. Therefore it would fit well into the noble gases.

10. Predict the number of valence electrons for each element based on its location in the Periodic Table  of Elements. You will need to use the table in your textbook

Barium                2 electrons                    Alkali earth metals

Xenon                 8 electrons                   Noble gases

Potassium          1 electron                       Alkali metals

Learn more:

Periodic table brainly.com/question/10874792

Alkali metals brainly.com/question/6324347

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