Explanation:
Causes of climate change are:
1.)Smoke from Vehicles and industrial activities
2.) Burning of polythenes.
3.) Because of green house effect
Effects are:
1.) Extinction of birds,plants and animals
2.) Melting of glaciers
3.) Rise in global temperature
It is an approximation of its mass number. Each isotope of an element has a different mass number.
Answer:
<em>The number of electrons in the outermost shell of an element is represented in the periodic table as the group number that element is situated in. ... the number of electrons in all shells of an element is represented in the periodic table as the element's atomic number.</em>
Explanation:
<em>thatdummyemily </em>
<em>hope this helps srry if it doesn't tho, but if it does help can u plz mark me brainlist</em>
Answer:
Number of valence electrons
Explanation:
A family of elements is defined as a specific group of those elements. Groups in the periodic table are identified by columns, e. g., group 1A contains alkali metals, group 2A contains alkaline earth metals, group 7A consists of halogens, group 8A contains noble gases etc.
The group number corresponds to the valence electrons these atoms have. The number of protons for each atom is different and the level of reactivity depends on the size of the atom mainly, as well as electronegativity.