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Electronegativity , symbolized as ? , is the tendency of an atom to attract shared electrons (or electron density) to itself .
An atom’s electronegativity is affected by both its atomic number and the distance at which its valence electrons reside from the charged nucleus .
Metals show a lower value of electronegativity as compared to the non-metals .
Fluorine is the most electronegative element on the periodic table .
Cesium is the least electronegative element .
The value of electronegativity increases across a period and the value of electronegativity decreases as we move down the group .

Electropositive character of an element is its ability to lose electrons and form positive ions. Now, as on moving from left to right in a period of periodic table, the nuclear charge increases due to the gradual increase in number of protons, so the valence electrons are pulled more strongly by the nucleus. Thus, it becomes more and more difficult for the atoms to lose electrons causing a decrease in the electropositive character of elements on moving from left to right in a periodic table.

Group 18th elements are named as noble gases as they are very stable due to having the maximum number of valence electrons their outermost shell can hold , hence they rarely react with other elements .

Group 1 elements – Alkali metals

Group 2 elements – Alkaline earth metals

Group 17 elements – Halogens

? Mercury is the closest planet to the sun.

? Mercury is the smallest planet in the solar system.

? Mercury is the fastest orbiting planet in the solar system, it has the shortest year.

? Venus is the brightest planet in the solar system and it has no satellite.

? Venus is the hottest planet in the solar system due to green house effect.

? It is called earth’s twin because it is approximately same size that of the earth.

? Plate tectonics is the theory that Earth’s outer shell is divided into large slabs of solid rock called plates, that glide over Earth’s mantle, the rocky inner layer above Earth’s core.

? Earth is called blue planet due to the presence of water.

? Earth is the only planet in the universe known to sustain life.

? Earth has only one satellite is the moon.

? The phrase learning disability covers some range of conditions that affects a person’s ability to learn new information.

? Children suffering from Learning disabilities exhibit exceptionally inferior qualities and capacities in terms of learning and understanding in comparison to the normal children of their grade or class. Such individuals experience extreme difficulty in the performance of specific mental skills, such as reading or arithmetic. Which is inconsistent with the person’s overall intelligence, sometimes linked to perceptual or memory problems.

? Causes of learning disability

Genetic factors
Physiological factors
Environmental factors

? Dysgraphia is a neurological disorder that generally appears when children are learning to write. It is a learning disability that affects in writing process in children.

? Dysgraphia is a neurological disorder of written expression that impairs writing ability and fine motor skills. It is a learning disability that affects children and adults, and interferes with practically all aspects of the writing process.

? Dyslexia is the disorder that involves difficulty in reading due to problems identifying speech sounds and decoding.

? Dysnomia is a learning disability in children, that is difficulty in recalling words, names, numbers, etc

? Attention deficit hyperactivity disorder is a mental health disorder that can cause above-normal levels of hyperactive and impulsive behaviours.

? People with ADHD trouble focusing their attention on a single task for long periods of time.

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