1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Andrews [41]
3 years ago
15

Why does it make sense that Hydrogen and Helium would be the first elements to form in the Universe?

Chemistry
1 answer:
Illusion [34]3 years ago
8 0

Answer:

Explanation:

It makes sense because Helium and Hydrogen only hold 1 and 2 subsequent protons/neutrons and electrons. When the Big Bang happened the entire universe was so hot that it was impossible for elements to form since it was impossible for electrons to stay bound to the atoms. After a few seconds the universe began to cool enough for electrons to bond to atoms and create different elements. Since Helium and Hydrogen have 1 and 2 electrons subsequently we can assume that they were the first elements to be created. Also they are the most abundant elements in the Universe which backs up this theory.

You might be interested in
What is the oxidation number of cl− in the hypochlorite ion clo−?
mariarad [96]

Answer : The oxidation number of chlorine (Cl) is, (+1)

Explanation :

Oxidation number : It represent the number of electrons lost or gained by the atoms of an element in a compound.

Oxidation numbers are generally written with the sign (+) and (-) first and then the magnitude.

When the atoms are present in their elemental state then the oxidation number will be zero.

Rules for Oxidation Numbers :

The oxidation number of a free element is always zero.

The oxidation number of a monatomic ion equals the charge of the ion.

The oxidation number of  Hydrogen (H)  is +1, but it is -1 in when combined with less electronegative elements.

The oxidation number of  oxygen (O)  in compounds is usually -2, but it is -1 in peroxides.

The oxidation number of a Group 1 element in a compound is +1.

The oxidation number of a Group 2 element in a compound is +2.

The oxidation number of a Group 17 element in a binary compound is -1.

The sum of the oxidation numbers of all of the atoms in a neutral compound is zero.

The sum of the oxidation numbers in a polyatomic ion is equal to the charge of the ion.

The given compound is, ClO^-

Let the oxidation state of 'Cl' be, 'x'

x+(-2)=-1\\\\x-2=-1\\\\x=+1

Therefore, the oxidation number of chlorine (Cl) is, (+1)

5 0
3 years ago
6. A box measures 11.25 inches in length, 8.1 inches in width and 6.85 inches in height. What is the
denis23 [38]

Answer:

I'd say 624.2^3 inches.

Explanation:

3 0
2 years ago
How do you draw 5 arrows showing uniformity
makkiz [27]

Answer:

I  don't really know what that is so here is a picture of it

Explanation:

4 0
2 years ago
An atom of gold has a mass of 3.271 x 10-22g. How many atoms of gold are in 5.00g of gold?
rosijanka [135]
To get the number of gold atoms, you have to divide the mass of the gold by the mass of the gold atom. It follows this simple equation  \frac{mass of gold}{mass of gold atom}. 

Let x be the number of gold atoms. Plug in the values to a calculator.

x = \frac{5.00g}{3.271 x 10-22g}
Both have the same units so the unit gram(g) can be cancelled. 
x then would be equal to 1.53x10^22. So there are 1.53x10^22 atoms of gold in 5 g of gold
3 0
3 years ago
What is the most abundant metalloid in the universe
yan [13]
The answer is Scicillion
3 0
3 years ago
Other questions:
  • Which expression is equal to the number of grams (g) in 2.43 kilograms (kg)?
    14·2 answers
  • The reactants side of an equation is shown. How many silver atoms should the products side of the equation have after a chemical
    12·1 answer
  • Carbon can bond to itself to form which of the following?
    6·1 answer
  • Light elements with an atomic number less than 20 generally have a neutron to proton ratio equal to
    7·1 answer
  • When 0.514 g of biphenyl (C12H10) undergoes combustion in a bomb calorimeter, the temperature rises from 25.8 °C to 29.4 °
    11·1 answer
  • The boiling point is the temperature at which (2 points) Select one: a. A solid becomes a liquid b. A liquid becomes a gas c. A
    15·1 answer
  • What is an example of a precipitation reaction and addition reaction?
    6·1 answer
  • Sevin, the commercial name for an insecticide used to protect crops such as cotton, vegetables, and fruit, is made from carbamic
    15·1 answer
  • How many particles are in 2.4 moles of carbon dioxide
    5·1 answer
  • How many grams of CO2 should be placed in a 250 mL container and -24°C to produce a pressure of 95K PA?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!