Question

periodic table basics

1. which elements had complete outer shells? give the name and symbol for each.

what do you notice about the location of these elements?

1. which elements had only one - valence electron? give the name and symbol for each.

what do you notice about location of these elements?

1. 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→cl→ar)
2. 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)
3. write the name of each family at the top of the columns on your periodic table using the following information.

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 outer shells

1. what do you notice about the location of the elements in each family?
2. in what family would you classify hydrogen? explain your choice.
3. in what family would each of these elements be classified?

radium -
iodine -
tin -
cesium -

1. 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 =
lead =
bismuth =
potassium =

Explanation:

Step1: Analyze valence - electron trend across a period

As we move from left to right across a row (period) in the periodic table (e.g., from Na to Ar), the number of valence electrons increases by 1. Sodium (Na) has 1 valence electron, magnesium (Mg) has 2, aluminum (Al) has 3, silicon (Si) has 4, phosphorus (P) has 5, sulfur (S) has 6, chlorine (Cl) has 7, and argon (Ar) has 8.

Step2: Analyze energy - level trend down a group

As we move down a group (column) in the periodic table (e.g., from H to Li to Na), the number of energy levels or shells increases by 1. Hydrogen (H) has 1 energy level, lithium (Li) has 2 energy levels, and sodium (Na) has 3 energy levels.

Step3: Determine element families

• Radium (Ra) belongs to the Alkaline Earth Metals family as it has 2 valence electrons.
• Iodine (I) belongs to the Halides family as it has 7 valence electrons.
• Tin (Sn) belongs to the Carbon Family as it has 4 valence electrons.
• Cesium (Cs) belongs to the Alkali Metals family as it has 1 valence electron.
• Barium (Ba) has 2 valence electrons as it is an Alkaline Earth Metal.
• Lead (Pb) has 4 valence electrons as it is in the Carbon Family.
• Bismuth (Bi) has 5 valence electrons as it is in the Nitrogen Family.
• Potassium (K) has 1 valence electron as it is an Alkali Metal.

Step4: Classify hydrogen

Hydrogen can be considered in a unique category on its own. However, based on its 1 valence electron, it can be related to the Alkali Metals family. But it is also a non - metal and has different chemical behavior compared to the other alkali metals.

Answer:

1. The number of valence electrons increases by 1 as you move from left to right across a period.
2. The number of energy levels or shells increases by 1 as you move down a group.
3. Radium - Alkaline Earth Metals, Iodine - Halides, Tin - Carbon Family, Cesium - Alkali Metals
4. Barium = 2, Lead = 4, Bismuth = 5, Potassium = 1
5. Hydrogen can be related to the Alkali Metals family due to having 1 valence electron, but it has unique non - metal properties.