JSIERT

(a)The element with electronic configuration (2,8,7) means 17 is chlorine. The no. of atomic number(Z) = no. of electrons(e) Therefore, the atomic number is 17. (b) An atom with electronic configuration 2, 8, 7 would be chemically similar to F (At. No. 9) because it has electronic configuration 2,7, Both have 7 electrons in the …

An atom has electronic configuration 2, 8, 7.
(a) What is the atomic number of this element?
(b) To which of the following elements would it be chemically similar? (Atomic numbers are given in parentheses.) N(7), F(9), P(15), Ar(18) Read More »

(a) Group 13 includes all of the elements that are found in the same column as boron. They each have three electrons in their valence shells as a result. All of the other elements in this group, including aluminium, gallium, indium, and thallium, are metals with the exception of boron, which is a non-metal. (b) …

(a) What property do all elements in the same column of the Periodic Table as boron have in common?
(b) What property do all elements in the same column of the Periodic Table as fluorine have in common? Read More »

(a) Neon contains two full shells. (b) The electronic configuration of magnesium is 2, 8, 2. (c) Silicon has four electrons in its valence shell and a total of three shells. (d) Boron has three electrons in its valence shell and a total of two shells. (e) The second shell of carbon has twice as …

Which element has?
(a) Two shells, both of which are completely filled with electrons?
(b) The electronic configuration 2, 8, 2?
(c) A total of three shells, with four electrons in its valence shell?
(d) A total of two shells, with three electrons in its valence shell?
(e) twice as many electrons in its second shell as in its first shell? Read More »

The answer is Magnesium (Mg), It has a valency of 2, which is the same as the group (a) Na (b) Mg (c) AI (d) Si Also, Mg, when combined with chloride, forms Magnesium Chloride ( MgCl2).

The atoms lose their electrons more readily, hence the right response is c. The claim that atoms lose electrons more readily is untrue since the non-metallic character rises as we move from left to right across the periods of the periodic table. As a result, there is less of a tendency to lose an electron.

Be and Ga are to be the most metallic. In Be and Ga, Ga is bigger in size and hence has a greater tendency to lose electrons than Be. Therefore, Ga is more metallic than Be.

Lithium (Li) and Beryllium (Be) are the metals among the first ten elements in the Modern Periodic Table.

(a) Since they only have one valence electron in their outermost shells, they are very unstable. Due to their easy reaction with water, hydrogen is released. They are also called alkali metals. In order to release hydrogen, they rapidly react with water.(b)They are quite stable since their outermost shells are full. They only react under …

(a) Lithium, sodium, and potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements? (b) Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common? Read More »

(a) Lithium (Li), Sodium (Na) and potassium (k) have one electron in their outermost shells.(b) Magnesium (Mg) and Calcium (Ca) have two electrons in their outermost shells.(c) Neon (Ne), Argon ( Ar ) and Xenon ( Xe ) have 8 electrons means filled the outermost shells.

Calcium (Ca) and Beryllium(Be) are similar to Magnesium (Mg) because all three elements belong to the same group and have two (2) valence electrons in their outermost shell.