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
dusya [7]
3 years ago
7

Atoms of elements in the same group have the same number of . This is why they have similar chemical properties.

Chemistry
2 answers:
andrew11 [14]3 years ago
9 0

Answer: its , valence electrons  I just did it

Dennis_Churaev [7]3 years ago
4 0

Answer:

Same number of electrons in their outer shell.

Explanation:

Whe working out their electronic configuration ( by looking at the atomic number) , one will find out that the number of electrons in their outer shell is also the same so the elements have to lose or gain the same amount of electrons to become stable.

You might be interested in
"Calculate the number of millimoles in 500 mg of each of the following amino acids: alanine (MW = 89), leucine (131), tryptophan
Cloud [144]

Answer:

- Alanine =  5.61 mmoles

- Leucine = 3.81 mmoles

- Tryptophan = 2.45 mmoles

- Cysteine = 4.13 mmoles

- Glutamic acid = 3.40 mmoles

Explanation:

Mass / Molar mass = Moles

Milimoles = Mol . 1000

500 mg / 1000 = 0.5 g

- Alanine = 0.5 g / 89 g/m → 5.61x10⁻³ moles  . 1000 = 5.61mmoles

- Leucine = 0.5 g / 131 g/m → 3.81 x10⁻³ moles  . 1000 = 3.81 mmoles

- Tryptophan = 0.5 g / 204 g/m →  2.45x10⁻³ moles . 1000 = 2.45 mmoles

- Cysteine = 0.5 g / 121 g/m → 4.13x10⁻³ moles . 1000 = 4.13 mmoles

- Glutamic acid = 0.5 g 147 g/m → 3.40x10⁻³ moles . 1000 =  3.4 mmoles

5 0
3 years ago
I need help with B and C
lakkis [162]
B) Mg is the alkaline earth metal w/12 protons so following the periodic table to the halogen in the same period is

Cl: Chlorine

C) The Neutral noble has w/ 18 electrons is argon so the metal in the same row is

Na: Sodium
8 0
3 years ago
A radioactive substance of mass 768g has a half life of 3 years. After how many years does it leave only 6g undecayed?​
vagabundo [1.1K]

Answer:

The answer is 21 years.

Explanation:

7×3

8 0
3 years ago
Read 2 more answers
What is the percent composition for the compound NaBr? (8C)
ehidna [41]

Answer:

the answer is D

Explanation:

percentage composition=  mole of the substance divided by the total molar mass of the compound multiplied by 100.

3 0
3 years ago
Which is a characteristic of a decomposition reaction? Substance P replaces X in the compound XY. Substance XYZ breaks down into
Law Incorporation [45]

Substance P replaces X in the compound XY

this is the characteristic of decomposition reaction

6 0
3 years ago
Other questions:
  • Which symbol in a chemical equation separates the reactants from the products?​
    9·2 answers
  • What is the definition of relief in science terms
    15·1 answer
  • All of the noble gas elements except neon have 8 electrons in their outermost energy level. True or false
    14·1 answer
  • Which of the following statements is true? A. Democritus discovered the proton. B. Dalton discovered the proton. C. Thomson disc
    14·1 answer
  • What is the percent yield of potassium chloride if potassium reacts with excess chlorine gas to produce 10.3 grams of potassium
    8·1 answer
  • Identify the spectator ions in this reaction. Check all that apply. 2H+ + CrO4– + Ba2+ + 2OH– Ba2+ + CrO4– + 2H2O H+ CrO4– Ba2+
    10·2 answers
  • Is pentacosane a molecular compound?
    10·1 answer
  • In the reaction HCl + KOH ® KCl+ H2O, the spectator ions are:
    10·1 answer
  • When H2SO4 is added to PbI2, a precipitate of PbSO4 forms. The PbSO4 is then filtered from the solution, dried, and weighed. If
    6·1 answer
  • Write a journal entry from the perspective of a particle of light, called a photon. Your story should follow the photon as it tr
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!