An atom of element X will have an electron configuration of 2-8-18-7. Therefore, option (4) is correct.
Those chemical elements present in the same group of the periodic table have similar chemical properties. Elements are placed in vertical columns that have the same number of electrons in their valence shell and identical chemical properties.
On the periodic table, the vertical columns are known as groups because of their identical chemical behavior. All the chemical elements of a group (1 to 18) have similar chemical properties.
The atomic number of chlorine is 17 and the distribution of electrons in its shells is 2, 8, 7. So, chlorine exhibits seven electrons in its outermost shell. Therefore, the atom which will carry seven electrons in its outermost shell will have identical chemical properties as that of chlorine.
Hence, out of the four options, the atom with electronic configuration 2-8-18-7 will have similar chemical properties as those of chlorine.
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Answer: Option (4) is the correct answer.
Explanation:
Chemical properties depend on the number of electrons present in the valence shell.
Atomic number of chlorine is 17 and electrons present in its shells are distributed as 2, 8, 7. So, there are 7 electrons present in the outermost shell.
Therefore, the atom which will also have 7 electrons present in its outermost shell or valence shell will have similar chemical properties as that of chlorine.
Hence, out of the given options atom with electronic configuration 2-8-18-7 will have similar chemical properties.
b) Br2 (L)
c) Ar (g)
d) Ag (s)
The element with 25 protons is manganese (Mn). This number helps to identify the element.
Manganese (Mn) is a kind of substance found in the periodic table and it has the number 25. The atomic number tells us how many protons are in an atom's nucleus.
For manganese, the atomic number is 25, which means there are 25 protons in the nucleus. The number of protons in an atom of manganese makes it a special element. Every element on the periodic table is assigned a unique number called an atomic number.
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b. Carbon, atomic number 6
c. Neon, atomic number 10
d. Fluorine, atomic number 9
Answer:
Neon, atomic number 10, is stable.
Explanation:
Valencia electrons are the electrons found in the last electronic layer (called valence orbitals). These electrons are what determine the ability of the atom to form bonds. When an element joins another, it does so through its valence electrons.
The noble gases include the elements of group 18 of the periodic table. The noble gases are characterized by their very low chemical reactivity because they are very stable. This is because they have the full valence layer (complying with the octet rule, that is, they have 8 electrons at their last energy level, with the exception of helium that has 2 electrons), causing them to have a low tendency to capture or release electrons . That is why they are also called inert gases.
The Neon, whose atomic number is 10, belongs to the group of noble gases. So this element is stable.