In the Modern Periodic Table, which are the metals among the first ten elements?
Lithium (Li) and Beryllium (Be) are the metals among the first ten elements in the Modern Periodic Table.
Periodic Classification of Elements
(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?
(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 …
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
(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.
Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
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.
How could the Modern Periodic Table remove various anomalies of Mendeleev’s Periodic Table?
(a) The elements are arranged in the Modern Periodic Table according to increasing atomic number. This eliminates the oddity relating to specific elemental pair pairs in Mendeleev\’s periodic table. (b) Nickel has an atomic number of 28 and cobalt has an atomic number of 27. Therefore, despite having a larger atomic mass than nickel, cobalt …
Why do you think the noble gases are placed in a separate group?
Due to their inertness and low atmospheric concentration, noble gases are classified into a separate groups. To order to prevent them from affecting the natural order, they are confined to a separate group called the Zero group.
. What were the criteria used by Mendeleev in creating his Periodic Table?
Mendeleev concentrated on various compounds created when different elements combined with oxygen and hydrogen. He noted the relationship between the atomic masses of various elements while developing his periodic table, among other physical properties.
Besides gallium, which other elements have since been discovered that were left by Mendeleev in his Periodic Table? (Any two)
Germanium(Ge) and Scandium(Sc) are the elements that are left by Mendeleev in his Periodic Table since its discovery.
Why do you think the noble gases are placed in a separate group?
Mendeleev concentrated on various compounds formed when different elements combined with oxygen and hydrogen. He observed the relationship between the atomic masses of various elements while developing his periodic table, among other physical qualities.
What were the criteria used by Mendeleev in creating his Periodic Table?
Mendeleev concentrated on various compounds formed when different elements combined with oxygen and hydrogen. He observed the relationship between the atomic masses of various elements while developing his periodic table, among other physical qualities.