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
In-s [12.5K]
3 years ago
14

Which two periods have the same number of elements ​

Chemistry
2 answers:
Stels [109]3 years ago
7 0

Answer:

4 & 5 have the same number of elements

Bogdan [553]3 years ago
6 0

Answer:

Periods 2 and 3 have the same number of elements.

Explanation:

I think periods  4 and 5 also have the same number of elements.

You might be interested in
Which models of the atom include a structure that is mostly made of empty space?RutherfordThomsonBohrQuantum mechanical
Luba_88 [7]
<h2>Answer:</h2>

Rutherford's models

<h2>Explanations:</h2><h2>What is the electron cloud model?</h2>

There are known as the region where electrons are found especially in the nucleus.

According to the five basic atomic models which have contributed to the structure of the atom itself, the Rutherford's models of the atom include a structure that is mostly made of empty space compared to thomson that proposed the plum pudding model of the atom

4 0
1 year ago
Assume that the pressure inside of the 1 liter balloon is 200,000 Pa, what is the explosive energy in the inside the balloon? Ex
AysviL [449]

Answer:

200 Joules is the explosive energy in the inside the balloon. And that is  9.523\times 10^{-5}1 lb of TNT.

Explanation:

Pressure=\frac{force}{Area}=\frac{Force\times distance}{Area \times distance}=\frac{Energy}{Volume}

Volume of the balloon = V = 1 L = 0.001 m^3

Pressure inside the balloon ,P= 200,000 Pa =200,000 N/m^2

Explosive energy in the inside the balloon be E.

E = Pressure × Volume

E=200,000 N/m^2\times 0.001 m^3=200 Joules

1 lb of TNT = 2.1\times 10^6 J

200 Joules = 200\times \frac{1}{2.1\times 10^6 }1 lb of TNT

= 9.523\times 10^{-5}1 lb of TNT

5 0
3 years ago
Help?......please???
Flura [38]

Answer:im in middle school in know this but w x y = d

Explanation:so your answer is d :)

5 0
2 years ago
A covalent compound that shares two pairs of electrons.<br> What is it?
Nitella [24]
The two oxygen atoms share two pairs of electrons, so two covalent bonds hold the oxygen molecule together
3 0
3 years ago
Can someone please help its science
anastassius [24]

Answer:

c

Explanation:

6 0
2 years ago
Read 2 more answers
Other questions:
  • Which best explains why scientific theories grow stronger over time? (2 points)
    13·1 answer
  • If it takes 43.32ml of .1M NaOH to neutralize a 50ml HCL solution, how many moles of NaOH were added to the HCL solution?
    12·1 answer
  • A student performs an experiment that produces solid sodium chloride. He uses four different catalysts and lets the reaction run
    14·1 answer
  • A 25.00 mL aliquot of concentrated hydrochloric acid (11.7M) is added to 175.00 mL of 3.25M hydrochloric acid. Determine the num
    10·1 answer
  • Three functions of the stem​
    14·2 answers
  • A chemist adds a sample of an ideal gas to a balloon and measures its volume. The chemist removes some of the gas from the ballo
    9·1 answer
  • Identify each of the following properties as more typical of organic or inorganic compound
    7·1 answer
  • Gravity on Earth is 9.8 m/s2, and gravity on the Moon is 1.6 m/s2.
    8·1 answer
  • How many grams of hcl would be produced if 54 grams of water were used
    5·2 answers
  • The green light emitted by a stoplight has a wavelength of 525 nm. What is the frequency of this photon? (c = 3.00 × 10⁸ m/s).
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!