The third period contains eight elements : sodium, magnesium, aluminium, silicon, phosphorus, sulfur, chlorine, and argon. The first two, sodium and magnesium, are members of the s-block of the periodic table, while the others are members of the p-block.
How many elements are there in the 3rd group?
Although some controversy exists regarding the composition and placement of this group, it is generally agreed among those who study the matter that this group contains the four elements scandium (Sc), yttrium (Y), lutetium (Lu), and lawrencium (Lr).
What is the maximum number of elements in the third period?
Answer: According to the 2n^2 rule, the maximum number of electrons in the third period = 2 x (3)^2 = 18 . But, the last shell cannot accommodate more than 8 electrons so, the number of electrons in third period is 8. Hence, the number of elements is also 8.
How many elements are present in 3rd and 4th period?
A new period begins when a new principal energy level begins filling with electrons. Period 1 has only two elements (hydrogen and helium), while periods 2 and 3 have 8 elements. Periods 4 and 5 have 18 elements .
Is the last element in period 3?
Argon is the last element in period 3.
Why is the third period contains 8 elements and not 18?
According to the 2n 2 rule, the maximum number of electrons in the third period = 2 x (3) 2 = 18. But, the last shell cannot accommodate more than 8 electrons so, the number of electrons in third period is 8. Hence, the number of elements is also 8.
Which property decreases along a period?
| Characteristic Period Group | Metallic property Decreases Increases | Atomic radius Decreases Increases | Electron negativity Increases Decreases | Electron affinity Increases Decreases |
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Does period 4 have 3 valence electrons?
Scandium atomic number 21 is in the fourth period. s, p and d . 1st , 2st , 3rd and 4th . for a total of 3 valance electrons .
What element is in Group 6 Period 3?
Group 6A (or VIA) of the periodic table are the chalcogens: the nonmetals oxygen (O), sulfur (S) , and selenium (Se), the metalloid tellurium (Te), and the metal polonium (Po).
Why elements are arranged in 4th period?
The reason for the arrangement of elements in the period is based upon the atomic number . In all periods, including the elements are arranged according to the atomic number in increasing order.
What is the first element of Period 3?
| Hydrogen | Rubidium | Strontium | Yttrium | Zirconium | Niobium |
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What is the second last element of Period 3?
1. Second last element of third period is chlorine with atomic number 17. 3.
What is the element in Group 1 Period 3?
| Period Group | 1 H 1 | 2 Li 3 F 9 | 3 Na 11 Cl 17 | 4 K 19 Br 35 |
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Why does period 3 only have 8 elements?
According to the 2n 2 rule, the maximum number of electrons in the third period = 2 x (3) 2 = 18. But, the last shell cannot accommodate more than 8 electrons so, the number of electrons in third period is 8. Hence, the number of elements is also 8.
Which one is the shortest period?
The first period is the shortest period in the periodic table as it have only two elements i.e. H and He. The period in which the maximum number of elements are present in 6th period. It is the longest period of the periodic table as it have 32 elements.
Why does period 2 have 8 elements?
In the first period, the first electron shell
