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
cestrela7 [59]
3 years ago
15

Read the given expression. X = number of protons − number of core electrons Which of the following explains the identity of X an

d its trends across a period? X is the effective nuclear charge, and it remains constant across a period. X is the screening constant, and it remains constant across a period. X is the effective nuclear charge, and it increases across a period. X is the screening constant, and it increases across a period.
Chemistry
1 answer:
shepuryov [24]3 years ago
5 0

<u>Answer: </u>The correct statement is X is the effective nuclear charge, and it increases across a period.

<u>Explanation:</u>

We are given that:

X = number of protons − number of core electrons

Effective nuclear charge is defined as the actual nuclear charge (Z = number of protons) minus the screening effect caused by the electrons present between nucleus and valence electrons. These electrons are the core electrons.

The formula used for the calculation of effective nuclear charge given by Slater is:

Z^*=Z-\sigma

where,

Z^* = effective nuclear charge

Z = atomic number or actual nuclear charge or number of protons

\sigma = Screening constant

The effective nuclear charge increases as we go from left to right in a period because nuclear charge increases with no effective increase in screening constant.

Hence, the correct answer is X is the effective nuclear charge, and it increases across a period.

You might be interested in
When do you use 6.02*10^23?? Do you use it when going to atoms or molecules????
Andrew [12]
You would use it in both atoms and molecules if it’s in are large quantity
3 0
3 years ago
2NH3 → N2 + 3H2 If 2.22 moles of ammonia (NH3) decomposes according to the reaction shown, how many moles of hydrogen (H2) are f
Rashid [163]

Answer:

C

Explanation:

According to the mole ratio, using 2NH3 will give you 3H2. Which means in order to find the moles of H2 you would only need to divide 2 and multiply 3 to get the amount of moles of H2 produced.

7 0
3 years ago
What is the atomic radius <br> of mercury?
cricket20 [7]

The answer is 155 pm, hope this helps!

4 0
2 years ago
What does the atmoic weight 1 in hydrogen tell scientists
Paul [167]

Explanation:

The atomic number is equal to the number of protons in an atom's nucleus. Hydrogen's atomic number is 1 because all hydrogen atoms contain exactly one proton.

3 0
2 years ago
Read 2 more answers
I’m so confused somebody help lol
Marysya12 [62]

Answer:

lol☺️☺️☺️☺️☺️☺️☺️☺️

5 0
3 years ago
Read 2 more answers
Other questions:
  • Hydrangea plant's petals change to which colour on the addition of acids?
    11·1 answer
  • Can you help.me this above question. ..​
    14·1 answer
  • A student inflates a balloon for a party inside her house, where the temperature is 23°C. She then takes the balloon outside, wh
    13·2 answers
  • A student fills her burette with NaOH to the 2.5 mL mark. She titrated her sample of the NaOH until she reaches the endpoint (i.
    6·1 answer
  • HELP NEEDED 20POINTS i have alot of questions of PATTERNS OF INHERITANCE
    14·2 answers
  • Which statement accurately describes the chemical symbol of an element?
    11·2 answers
  • I'll give brainliest to the best answer!!
    11·2 answers
  • Give the name of the following molecule. A compound with a total of seven carbons with a double bond and the rest single bonds.
    14·2 answers
  • Identify and label the bronsted lowry acid, its conjugate base, the bronsted-lowry base, and its conjugate acid in each of the f
    10·1 answer
  • Any liquid or material that is likely to catch fire should be kept away from a
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!