1. In which period and which group is the element that has the ground-state elec

Question

1. In which period and which group is the element that has the ground-state electron configuration [Rn]7s2?

2. What Element is it?

3. In which period and which group is the element that has the ground-state electron configuration [Ar]4s23d104p4?

4. What element is this?

5. Can you explain this? I don't understand this concept: Write the electron configuration for Ba without using the noble gas abbreviated form.

Express your answer in complete form, in order of increasing orbital energy. For example, 1s22s2 would be entered as 1s^22s^2.

6. In which period and group in the periodic table are these atoms found?

-1s22s22p4

-1s22s22p63s1

-1s22s22p63s23p64s23d104p4

Explanation / Answer

Answer:

1) Radium which is in the 2nd group (IIA) and 7 period has a ground satte configuration of [Rn]7s2

2) It is Radium    'Ra' with atomic number 88.

3) in the group VIA and in the period 4

4) the element is Selenium with symbol Se and atomic number 34

5)electron configuration for Ba without using the noble gas abbreviated form

Ba (Barium):

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2

6) In which period and group in the periodic table are these atoms found?

-1s22s22p4       (Oxygen O)       group: VIA     ;     period: 2

-1s22s22p63s1    (Sodium Na)      group: IA ; period : 3

-1s22s22p63s23p64s23d104p4    (Bromine   Br) group: VIIA     ;     period: 4

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