Answer: be found in group 17 and be highly reactive
Explanation:
Elements are distributed in groups and periods in a periodic table.
Elements that belong to same groups will show similar chemical properties because they have same number of valence electrons.
Flourine, chlorine, bromine and iodine are elements which belong to Group 17. All of them contain 7 valence electrons each and need one electron to complete their octet.
The chemical reactivity of elements is governed by the valence electrons present in the element and thus all of them are highly reactive.
Answer:
Our star ,that is, Sun belong to Population I.
Explanation:
In 1940s, stars were divided into two categories by Wlter Baade:
a. Population I (Metal-rich)
b. Population II (Metal-poor)
Population I stars tend to be luminous, concentrated in the disks of spiral galaxies. They are still hot and young containing rich amount of heavy metals.
Sun falls in this category.
Population II stars tend to be less luminous found in the nucleus of the galaxy.
They are less hot. They are poor in heavy metals because they are old.
Answer:2000cm3
Explanation: this is Charles' law which has the expression V1/T1 = V2/T2
Making V2 the subject of the formula, we have that
V2 = V1 x T2/ T1
= 1000 x 600 / 300
= 2000cm3
Where:
V1= initial velocity
V2= Final velocity
T1= initial temperature
T2= Final temperature
Answer:
The size of the gravitational force is proportional to the masses of the objects and weakens as the distance between them increases. Both objects exert an equal attractive force on each other: a falling object is attracting the Earth with the same size force as the Earth is attracting it