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
Goshia [24]
3 years ago
7

Which of the following has three electrons in its valence shell?

Chemistry
2 answers:
lianna [129]3 years ago
7 0

valence electrons are the number of electrons in the outermost shell.

electron configuration is where the electrons are arranged in ascending order of energy shells

the electron configurations for the elements given are as follows

C - 2,4

Al - 2,8,3

Na - 2,8,1

Ca - 2,8,8,2

from the given elements, Aluminium has 3 electrons in its outermost shell.

answer is Aluminium

Lady_Fox [76]3 years ago
3 0
Aluminum because its in family three
You might be interested in
A substance composed of two or more elements in a fixed, definite proportion is.
Arisa [49]

Answer:

Compound

Explanation:

-compound is a chemical substance composed of many identical molecules composed of atoms from more than one element held together by chemical bonds.

7 0
2 years ago
Read 2 more answers
2. List and explain the three steps for solving a numeric problem.
Charra [1.4K]

Answer:

The steps for solving a numeric word problem are analyze, calculate, and evaluate. To solve a word problem, you must first determine where you are starting from (identify what is known) and where you are going (identify the unknown).

6 0
3 years ago
How does lanthanide contraction influence the density of period 6 transition element​
Kitty [74]

Answer:

For example, the atomic radius of the metal zirconium, Zr, (a period-5 transition element) is 155 pm (empirical value) and that of hafnium, Hf, (the corresponding period-6 element) is 159 pm. ... The increase in mass and the unchanged radii lead to a steep increase in density from 6.51 to 13.35 g/cm3.

Explanation:

6 0
3 years ago
Which type of reaction is Pb(NO3)2 + 2HCl → PbCl2 + 2HNO3?
Ganezh [65]

Answer:- D. Double- replacement reaction

Explanations:- In general, the decomposition reactions looks like:

AB\rightarrow A+B

The given reaction looks different than this and so it is not decomposition reaction.

A single-replacement reaction looks like:

AB+C\rightarrow AC+B

Our reaction looks different from this so single-replacement is also not correct.

Synthesis reaction looks exactly opposite to decomposition reaction.

A+B\rightarrow AB

The given reaction is different than this and so it is not synthesis reaction also.

A double-replacement reaction looks like:

AB+CD\rightarrow AD+CB

In this reaction, the ions are exchanged as could be seen in the general reaction. On reaction side,A is with B and C is with D. On product side, A is with D and C is with B.

The same is happening in the given reaction. Nitrate ion is with lead metal on reactant side and chlorine is with hydrogen, On product side, Chlorine is with lead metal and nitrate ion is with hydrogen. So, ion exchange has taken place here and so this is a double-replacement reaction and choice D is correct.

4 0
3 years ago
A rub-
lidiya [134]
Because it’s possible for the book to fall but it’s not yet falling if u understand
8 0
2 years ago
Other questions:
  • What is atomic mass of an element stands for
    12·1 answer
  • Which of the following electron configurations describes an element that is a noble gas?
    5·2 answers
  • Buffering capacity refers to: the effectiveness of commercial antacids the extent to which a buffer solution can counteract the
    12·1 answer
  • Is a girl doing any work while she stands still and holds a box? Why or why not?
    11·1 answer
  • 1) Ions are formed between positive or negative charge.
    11·1 answer
  • 4 main parts of a flower Include the function of each pls help me
    14·1 answer
  • 2CuS + 3O2 = 2CuO + 2SO2
    6·1 answer
  • Determine the mass of CO2 gas produced when 8.24 g of NaHCO3 is added to a solution that contains 4.41 g of HCl.
    14·1 answer
  • Name a property copper has?
    12·1 answer
  • I need help, plz help me with this problem
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!