This is actually really is. Notice how the protons + the neutrons equal the top number next to the element and the bottom one is the amount of protons.
So for Rn, it already gives you the protons and the atomic number (the top number), you just subtract them ---> 209-86= 123 neutrons.
I don't have a periodic table to look at, but for the next one just add the protons and the neutrons to get the atomic number (the atomic number will be under the element symbol) and look for it on the periodic table to find the element and so on.
I hope this helps ♥
Explanation:
Determine whether the following symbols are universal or contextual. In "The Nightingale and the Rose,"
Oscar Wilde uses a red rose as a symbol for love. In To Kill a Mockingbird, Harper Lee uses a mockingbird as a symbol for innocence.
In A Little Princess, Frances Hodgson Burnett uses hot buns as a symbol for the connection between the main character and a poor street child.
In "The Water of Life," the Brothers Grimm use water as a symbol for life.
Answer:
C2H3O
Explanation
:
C. H. O
48.6. 8.2. 43.2
r.a.m 12. 1. 16
no.of 48.4÷12. 8.2÷1. 43.2÷16
moles
4.05÷2.7. 8.2÷2.7. 2.7÷2.7
2. 3. 1
Therefore C2H3O
E is the answer.
A gas during a collision is elastic, and there is no other option that matches gas behaviour so E is the answer.
Hope it helped!