How does the electronic configuration of an atom relate to its position in the Modern Periodic Table?
Answer: The electronic configuration of an element determines the number of valence electrons and the number of shells present. We... View Article
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Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the Periodic Table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?
Answer: Atomic number of Nitrogen = 7 Electronic configuration of Nitrogen is Nitrogen (Z= 7) = 1s2 2s2 2p3 Atomic... View Article
What property do all elements in the same column of the Periodic Table as fluorine have in common?
Answer: Fluorine is the ninth element with a total of 9 electrons. The first two electrons will go in the... View Article
What property do all elements in the same column of the Periodic Table as boron have in common?
Answer: Boron is a chemical element with the atomic number of five that is present in the earth’s crust. Boron... View Article
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?
Answer: (a) Neon has two shells which are completely filled. The elements in Group 18 of the periodic table are... View Article
Element X forms a chloride with the formula XCl2, which is a solid with a high melting point. X would most likely be in the same group of the Periodic Table as (a) Na (b) Mg (c) AI (d) Si
Answer: (b) Mg We can see from the formula XCl2 that one atom of X combines with two atoms of... View Article
Which of the following statements is not a correct statement about the trends when going from left to right across the periods of Periodic Table. (a) The elements become less metallic in nature. (b) The number of valence electrons increases. (c) The atoms lose their electrons more easily. (d) The oxides become more acidic
Answer: (c) The atoms lose their electrons more easily. Metallic character of an element is defined as the easiness of... View Article
By considering their position in the Periodic Table, which one of the following elements would you expect to have maximum metallic characteristic? Ga Ge As Se Be
Answer: Metallic character of an element is defined as the easiness of its atom in losing electrons. According to the... View Article
In the Modern Periodic Table, which are the metals among the first ten elements?
Answer: Metals are minerals or substances that form naturally below the surface of the Earth. Most metals are lustrous or... View Article
Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common?
Answer: The atoms of helium and neon have their valence shell completely filled with electrons. The number of valence electron... View Article
Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements?
Answer: Metals are minerals or substances that form naturally below the surface of the Earth. Most metals are lustrous or... View Article
Name (a) Three elements that have a single electron in their outermost shells. (b) Two elements that have two electrons in their outermost shells. (c) Three elements with filled outermost shells
Answer: The outermost orbital shell of an atom is called its valence shell. These electrons take part in bonding with... View Article
Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
Answer: The chemical reactions of calcium (Ca) and strontium (Sr) are predicted to be similar to those of magnesium (Mg).... View Article
How could the Modern Periodic Table remove various anomalies of Mendeleev’s Periodic Table?
Answer: Mendeleev claimed the famous periodic law that “Element properties are a periodic function of their atomic weight.” Mendeleev placed... View Article
Why do you think the noble gases are placed in a separate group?
Answer: Mendeleev claimed the famous periodic law that “Element properties are a periodic function of their atomic weight.” Mendeleev placed... View Article
What were the criteria used by Mendeleev in creating his Periodic Table?
Answer: Mendeleev claimed the famous periodic law that “Element properties are a periodic function of their atomic weight.” Mendeleev placed... View Article
Besides gallium, which other elements have since been discovered that were left by Mendeleev in his Periodic Table? (Any two)
Answer: The properties of elements are a periodic function of their atomic masses. It was the discovery of atomic number... View Article
Use Mendeleev’s Periodic Table to predict the formulae for the oxides of the following elements: K, C, AI, Si, Ba.
Answer: In Mendeleev’s periodic table, oxygen belongs to group VI A. It has a valency of 2. In the same... View Article
What were the limitations of Newlands’ Law of Octaves?
Answer: In the year 1864, the British chemist John Newlands attempted the 62 elements known at that time. He arranged... View Article
Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).
Answer: Copper, rather than steel or an alloy of iron, is used to make hot water tanks because copper does... View Article
