Explanation:
Neon is in group 8/0, which means that it has a full outer shell. Atoms react to get a full outer shell but as neon already has a full outer shell, it doesn't react and stays monatomic.
However, chlorine is in group 7, so it needs 1 more electron to complete its outer shell, two chlorine atom share one electron each with each other so they have full outer shells. This is why chlorine is diatomic.
B) metals are found on the left side of the periodic table.
C) rare earth elements are in the first column, on the left.
D) transition metals are in the center of the periodic table.
Answer: C) rare earth elements are in the first column, on the left.
Explanation:
In fact, rare earth elements are in the third column, on the left.
The periodic table of the elements is an arrangement of the chemical elements in the form of a table, ordered by their atomic number (number of protons), by their configuration of electrons and their chemical properties. It was progressively developed over time as the scientific knowledge advanced; for this reason many modifications and corrections might be done in the future.
This table is divided into rows and columns, which represent the periods and groups or families. For its location the atomic number and valence of each element was considered.
In this sense, the elements in the periodic table are mainly arranged as follows:
-Alkali metals and Alkaline Earth metals in the first two columns, on the left.
-Rare earth elements in the third column (rows 6 and 7), on the left.
-Transition metals in the center.
-Basic metals and semi-metals to the right
-Non-metals to the right (and Hidrogen in the first row and column)
-Noble gases (or inert gases) farthest to the right.
Answer: The correct answer is Option C.
Explanation:
Elements are divided into 7 Periods and 18 Groups in a periodic table.
Metals are present on the left side of the periodic table. They are present from Group 1 to Group 14 of the periodic table.
Non-metals are present on right side of the periodic table. They are present from group 15 to group 17 of the periodic table.
Inert gases are present in the farthermost right side of the periodic table. They are present in group 18.
Transition metals are present in the center of the periodic table from group 3 to group 12.
Rare earth metals are present in group 3 from the left. All the elements present in lanthanides series are considered as rare Earth metals.
Hence, the correct answer is Option C.
(1) CO3 2– as the only negative ion in solution
(2) OH– as the only negative ion in solution
(3) NH4 + as the only positive ion in solution
(4) H+ as the only positive ion in solution
201 M
5.52 M
1. There are a number of ways to express concentration of a solution. This includes molarity. Molarity is expressed as the number of moles of solute per volume of the solution. The concentration of the solution is calculated as follows:
Molarity = 612 g (1 mol / 110.96 g) / 3.04 L
Molarity = 1.81 M
1.81 M is the polarity of a solution that contains 612 grams of CaCl2 in 3.04 liters of solution.
by a lowercase letter. This tells you the types of elements in the compound.
Answer:
Elements
Explanation:
The elements which are represented by a single uppercase letter, or represented by an uppercase letter followed by a lowercase letter. This tells you the types of elements in the compound.
Elements are one of the simplest chemical substances that cannot be decomposed in a chemical reaction or by any chemical means. They are made up of small indivisible particles called atoms, all having the same number of protons.
Chemical symbols which can be single uppercase or one uppercase followed by a lowercase letter, are used in Chemistry to represent elements. They are used in the composition of compounds. For example, 'H' for Hydrogen and 'Ca' for Calcium.
In Chemistry, elements are represented by one or two letters. The first letter is always uppercase and the second letter, if present, is lowercase. These are known as chemical symbols and they correspond to the elements in the Periodic Table. For instance, the symbol for Hydrogen is H, and for Calcium it's Ca. These symbols are used to denote elements in chemical compounds. For example, water (H2O) is a compound consisting of Hydrogen and Oxygen.
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