Answer: Option (A) is the correct answer.
Explanation:
A compound is a substance which contains two or more different atoms combined together.
Sodium is found as sodium chloride in nature. Sodium chloride is also known as common salt.
As it contains a sodium atom combined to a chlorine atom, therefore, it is a compound.
Thus, we can conclude that sodium is the element that is found in nature only in compounds.
An element's placement within a group on the periodic table is indicative of its electron configuration, specifically the number of valence electrons it has. As we move down a group, the principal quantum number increases, essentially moving to a higher energy level. Some elements show exceptions based on stability offered by half-filled or completely filled orbitals.
The placement of an element within a group on the periodic table has a direct correlation with its electron configuration. This connection is based on the fact that elements within the same group share the same number of valence electrons - electrons in the outermost shell of an atom that determine the chemical behavior of an element. This arrangement of elements gives the periodic table its periodic property, with recurring physical and chemical properties. An element's principal quantum number, representing the energy level of the electron, increases as we move down a group.
Although this pattern is generally accurate, there are exceptions to this rule, particularly when half-filled or completely filled orbitals can be formed which add to the atom's stability. Elements like chromium (Cr) and copper (Cu) demonstrate such anomalies.
The electron configuration of an atom, therefore, provides insights into the atom's properties, chemical behavior, and its placement on the periodic table. Understanding this connection between the location of an element on the periodic table and its electron configuration is crucial to predicting how elements will behave in chemical reactions.
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Answer:
80.0
Explanation:
edge 2020
b. are one of the major symptoms of depression
c. usually also lead to panic attacks
d. should be ignored even when they last a long period of time
Answer:
116
Explanation:
neutrons = mass number - proton number
66 = mass number - 50
add 50 on both sides
66 + 50 = 116
so the mass number is 116
Given:
KOH used to make 1.6 liters of 15% by mass solution with water
Required:
grams of KOH
solution:
the density of KOH is equal to 2.12 kg/L
multiply the known volume of KOH to the density and the percentage of KOH in water
mass of KOH = 1.6 L (2.12 kg/L)(0.15) = 22.61 grams of KOH
like gold,
but shatter into many pieces when struck by a
hammer, Iron Pyrite is..........
Explanation:
When gold is hammered it "squishes". Iron Pyrite is
known as "Fool's Gold". It is not..........
like gold,
but shatter into many pieces when struck by a
hammer, Iron Pyrite is..........
Gold is a malleable metal, able to deform without breaking when hammered. On the contrary, Iron Pyrite or 'Fool's Gold' is brittle; it shatters when struck due to its lack of malleability.
Gold is known as a malleable metal, which means it can be hammered or bent into different shapes without breaking. In contrast, Iron Pyrite, often known as 'Fool's Gold', is brittle, meaning it will shatter or break when struck by a hammer.
Malleability is a physical property of metals that allows them to be hammered or rolled into thin sheets. Gold is one of the most malleable metals and can be hammered into extremely thin sheets.
On the other hand, a brittle material like Iron Pyrite lacks this property of malleability. Instead of deforming under stress, it will fracture, this is why it shatters into many pieces when struck.
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