How does blood flow into the right atrium?(A)through the aorta.(B)through the pulmonary artery.(C)through the left ventricle.(D)through the vena cava. plz help if you don't know do not anwer

the answer is na (sodium)

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.