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How many energy levels would electrons of hydrogen and helium fill?
1st energy levels only in which hydrogen will have only one electron whereas helium will have two electrons.
How many elements make up period 1?
Only two: hydrogen and helium. This corresponds to the fact that there can be only two s orbital electrons in any electron shell, and the first shell has only s orbital electrons.
Why is helium used in a zeppelin?
Helium is much less dense than air, meaning it can provide lift. The only gas lighter than helium is hydrogen, which is too dangerous to use for such a purpose because it is extremely flammable. Helium, on the other hand is completely nonflammable. Aside from hydrogen no other gas is anywhere near as light as helium.
What gas is the lightest of all elements and is highly flammable?
Hydrogen is the lightest of all elements and is extremely flammable. It is also the most plentiful gas in the universe.
What is the second lightest gas?
The second lightest gas is helium. The lightest gas is hydrogen which is also the lightest element. They are very close on the Periodic Table.
What electrons have only one orbit or shell?
hydrogen (H) and helium (He)
How many energy levels would electrons of hydrogen and helium fill?
1st energy levels only in which hydrogen will have only one electron whereas helium will have two electrons.
What elements is the sun made of?
only two: hydrogen, and helium
Which elements have only 1 electron orbit or shell?
Hydrogen and Helium
Tiny particles of hydrogen fuses to helium in the sun?
Yes, they do. Because of the enormous gravity of the sun Hydrogen atoms fuse to each other (only 2) to make Helium.
Which of the following elements is the most chemically reactive helium hydrogen argon or neon?
Helium, argon, and neon are noble gases, so the only "reactive" element of the four is hydrogen.
Why do balloons only float with helium?
they don't float ONLY with helium. They float with any gas that is less dense than air, for instance hydrogen.
How many different types of atoms are in helium?
Helium is an element, so it is made of only one type of atom.
How many elements are there in the first period of periodic table?
Only the two with the smallest atomic numbers, hydrogen and helium. This corresponds to the fact that the innermost shell of electrons can contain only two electrons.
How many elements make up period 1?
Only two: hydrogen and helium. This corresponds to the fact that there can be only two s orbital electrons in any electron shell, and the first shell has only s orbital electrons.
Which elements have only one electron in itz orbit orshell?
hydrogen (H) and helium (He)
In a star atoms combine to form helium atoms?
Hydrogen- the only atom smaller
