Pre-Lab Study Questions / 9
1. Where are the valence electrons in an atom?
valen
2. How are positive and negative ions fomed?
3. Why are electrons shared in molecular compounds?
Solved
Show answers
More tips
- G Goods and services Should You Engrave Your Wedding Rings? Facts, Myths, and Considerations...
- L Leisure and Entertainment How to Land on the Moon: Your Comprehensive Guide...
- T Travel and tourism How to Use a Compass: A Beginner s Guide...
- C Computers and Internet Porn Banner: What It Is and How to Get Rid Of It?...
- C Computers and Internet Отправляем смс через интернет: легко и просто...
- L Leisure and Entertainment The Best Film of 2010: A Look Back at the Academy Awards...
- H Health and Medicine Simple and Effective: How to Get Rid of Cracked Heels...
- O Other How to Choose the Best Answer to Your Question on The Grand Question ?...
- L Leisure and Entertainment History of International Women s Day: When Did the Celebration of March 8th Begin?...
Answers on questions: Chemistry
- C Chemistry What are other signs of chemical change...
- C Chemistry Astudent investigates if extra yeast (this is an animal cell) or extra sugar will produce the most gas when mixed in a warm water and yeast solution. he uses two bottles with ½...
- C Chemistry How well did the landmases fit together this time...
- C Chemistry What product is formed at the positive electrode (anode) when 0.001 mol dm–3 h2so4 (aq) is electrolysed? a. hydrogen b. oxygen c. sulfur d. sulfur dioxide...
- C Chemistry Ihave 2 m3 of mineral ore sample. it has a mass of 1 x 194 kg. calculate the density of the ore sample and express your results in g/cm3 with the appropriate scisntic notion....
- C Chemistry Zachary adds 26.45 g to 2.55 g. how many significant figures should his answer have? two three four five...
- E Engineering Asteam turbine operates adiabatically at a power level of 3500 kw. steam enters the turbine at 2400 kpa and 500°c and exhausts from the turbine as saturated vapor at 20 kpa. what...
- B Biology Growth factors and cytokines both lead to tyrosine phosphorylation through receptors, but they do so through different mechanisms. what is the key difference between the receptors...
- B Biology Perform the same calculation for each of the belding s ground squirrel cohorts in order to answer the following question. which cohort of female belding’s ground squirrels produces...
- E Engineering Given values-- volume fraction a (msi): = 0.52 matrix modulus b (msi): = 0.24 composite modulus c (msi): = 48 percent fiber volume d (%): = 61 problem 1: working with a manufacturing...
Ответ:
See detailed answer with explanation below.
Explanation:
Valence electrons are electrons found on the outermost shell of an atom. They are the electrons in an atom that participate in chemical combination. Recall that the outermost shell of an atom is also referred to as its valence shell. Let us consider an example; if we look at the atom, sodium-11, its electronic configuration is 2,8,1. The last one electron is the valence electron of sodium which is found in its outermost or valence shell.
Positive ions are formed when electrons are lost from the valence shell of an atom. For instance, if the outermost electron in sodium is lost, we now form the sodium ion Na^+ which is a positive ion. Positive ions possess less number of electrons compared to their corresponding atoms.
Negative ions are formed when one or more electrons is added to the valence shell of an atom. A negative ion possesses more electrons than its corresponding atom. For example, chlorine(Cl) contains 17 electrons but the chloride ion (Cl^-) contains 18 electrons.
In molecular compounds, a bond is formed when two electrons are shared between the bonding atoms. Each bonding atom may contribute one of the shared electrons (ordinary covalent bond) or one of the bonding atoms may provide the both shared electrons (coordinate covalent bond). The shared pair may be located at an equidistant position to the nucleus of both atoms. Similarly, the electron may be drawn closer to the nucleus of one atom than the other (polar covalent bond) depending on the electro negativity of the two bonding atoms.
The electrons are shared in order to complete the octet of each atom by so doing, the both bonding atoms now obey the octet rule. For example, two chlorine atoms may come together to form a covalent bond in which each chlorine atom has an octet of electrons on its outermost shell.
Ответ:
what the hell I don't even know man