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
Amanda [17]
3 years ago
5

Help! 7th grade science!

Chemistry
1 answer:
Eva8 [605]3 years ago
7 0
I think is B not sure but good luck have a nice day
You might be interested in
When water vapor cools it condenses select the number that represents this process on the diagram
TiliK225 [7]
2 is the correct answer.
6 0
3 years ago
Read 2 more answers
Drop your insta gang’s <br> Let’s be friends
Zanzabum
Why don’t you have friends?
6 0
2 years ago
An atom of an element has 54 protons. Some of the elements atoms have 77 neutrons, while other atoms have 79 neutrons. What are
Alja [10]

Answer:

The atomic numbers of both are 54 while the mass numbers are 131 and 133 respectively.

Explanation:

- The number of protons = Atomic number. So, if the atom has 54 protons and it remained unchanged, then the two types of atoms of this element both have atomic numbers of 54.

- On the other hand, mass number is the sum of protons and neutrons

So, if type 1 has protons = 54 and neutrons = 77: mass number = 54 + 77 = 131

if Type 2 has protons = 54 and neutrons = 79: mass number = 54 + 77 = 133

(Since the possibility of atoms of the same element to have different mass numbers but the same atomic number is called isotopy). The two types of atoms with mass numbers 131 and 133 described are isotopes.

7 0
3 years ago
What is the number of electrons shared between the atoms in I2 molecule (That is an i not a 1)
labwork [276]
Iodine is one of seven elements that usually form as diatomic molecules. These other "diatomics" are O_2, H_2, F_2, Br_2, N_2, and Cl_2. They typically bond to themselves.

Iodine has seven valence electrons. Using valence shell electron pair repulsion (VSEPR) theory, we can predict the Lewis dot structure for I_2. We see there are fourteen electrons, and we can make a covalent bond, leaving three lone pairs on each atom. The bond replaces two electrons, so the number of electrons shared is two.

4 0
2 years ago
What is the number of orbit for calcium
CaHeK987 [17]
It has 20 electrons
7 0
3 years ago
Other questions:
  • A 12.8 g piece of aluminum (which has a molar heat capacity of 24.03 j/°c·mol) is heated to 82.4°c and dropped into a calorimete
    13·1 answer
  • Question 4b, c please.
    10·1 answer
  • “All compounds containing H atoms are acids, and all compounds containing OH groups are bases.” Do you agree? Give examples.
    8·1 answer
  • Which of the following compounds share electrons? NaCl CO CsF KBr
    8·1 answer
  • Calculate the atomic mass for copper using the weighted average mass method. Express your answer using two decimal places and in
    7·1 answer
  • Two solutions, initially at 24.60 °C, are mixed in a coffee cup calorimeter (Ccal = 15.5 J/°C). When a 100.0 mL volume of 0.100
    13·1 answer
  • How do scientists classify intrusive igneous features? according to shape, texture, and their distance from the nearest volcanic
    10·1 answer
  • What Do You Think It Means To Have a Balanced Or Unbalanced Chemical Equation?
    9·1 answer
  • Which of the following lists the correct symbol for the ion that tin forms when it loses 2 electrons, the correct classification
    6·2 answers
  • A student wants to heat a piece of iron so that its temperature rises by 20 degrees C. What information does she need about the
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!