<h2>Answer:</h2><h3>Term:</h3>
- A- : A nonmetal that gained one electron.
- B+: A metal that lost one electron.
- C-2: A nonmetal that gained two electron.
- D+2: A metal that lost two electrons.
Explanation:
A metal is an atom which is present in the first and second column of periodic table and have ability to lose electron.
So any cation which is formed by losing one electron will have positive sign and will be metal.
So B+ and D+2 are metals and have lost 1 and 2 electrons respectively.
On the other hand, nonmetals have capability to gain electrons.
So A- and C-2 are nonmetals that have lost 1 and 2 electrons respectively.
Answer:
C. Traits present in the last common ancestor of a certain group of species under consideration.
Explanation:
Ancestral character traits are the one that is present in the last common ancestor and all of its descendant groups. For example, the presence of the vertebral column is an ancestral trait for all the vertebrate groups such as birds and mammals as it was present in their last common ancestor and is also shared by them.
The correct option is D. electrons.
<span>Two or more atoms can be together if they share electrons with each other.</span><span>
By sharing, they form a covalent bond and that way the atoms can be stable.
The electrons being shared are</span>valence electrons and this <span>allows the atoms to fill their outer levels.</span>
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Explanation:
Most people will die from the negative health effects associated with stroke as indoor dirty air builds up.
Option C
<h3><u>Explanation:</u></h3>
Indoor air pollution is a very serious topic both in cities as well as rural areas. In the rural areas, the persons usually have their kitchen inside house, with minimal ventilation system and the smoke from burning coal or wood all accumulate inside house which contributes to most of indoor air pollution.
In cities, the outside air is itself polluted. Else, the smoke from burning chimneys, or smoking cigarettes also contribute to this pollution. Nevertheless, the particulate matters like dust and dirt are important sources in both these places.
Indoor air pollution is the main cause for COPD or bronchitis in non smokers. But most importantly, COPD indirectly precipitates to cardiac arrest or cardiac failure. Ingestion of kerosene vapour or soots and smokes actually increases the muscle fatigue, which can lead to muscle weakening. This leads to muscular discomfort and finally a stroke or IHD can precipitate.