Which of these pairs of elements have the same number of valence electrons phosphorus (P) and chlorine (Cl)
beryllium (Be) and calcium (Ca)
chlorine (Cl) and helium (He)
oxygen (O) and carbon (C)

Answers

Answer 1

Answer: Beryllium (Be) and Calcium (Ca)

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Which particle has the least mass alpha,neutron,betas particle,or proton

Which type of heat transfer can cause the butter to melt?A. Convection
B. Conduction
C. Radiation
D. Heat

Answers

Answer:

radiation

LOL but also heat

Explanation:

hope this helps

An atom in an excited state has an electron configuration of 2-7-2. Explain in terms of subatomic particles, why the excited atom described is electrically neutral.

Answers

The excited atom can be described as electrically neutral because from its electron configuration ;

The number of electrons ( 11 ) = Number of protons ( 11 )

From the electron configuration 2-7-2 the number of electrons equals ( 2 + 7 + 2 ) = 11 electrons, also the number of protons will be = 11 for the atom to be neutral. While the number of Neutron is not significant in the positivity or negativity of atoms.

The subatomic particles contained in an atom are protons, neutrons and electrons ( which are present in the outer most shell ) and represents the electron configuration of an atom. while the number of neutrons is determined by the Isotope.

Hence we can conclude that The excited atom can be described as electrically neutral because from its electron configuration ; The number of electrons = Number of protons .

Learn more : brainly.com/question/3610433

Answer:

Number of electrons: 11

Number of protons: 11

Number of neutrons : not enough information.

Explanation:

an atom contains sub atomic particles electrons, protons and neutrons.

Electrons are present in the outer shells.

The given atom contains eleven electrons.

The atom is neutral so the number of electrons will be equal to number of protons. The number of protons will be 11.

The number of neutrons will depend upon the type of isotope.

Commercially valuable fish my face extinction even though fish are a renewable resource?true
false?

Answers

the answer is true they may face extinction

Which substance can not be broken down by a chemical change?A) methane B) propanal C) tungsten D) water

Answers

Answer:

The Answer is ELEMENT

Explanation:

okay the answer to your question is Tungsten

NEED HELP AS SOON AS POSSIBLE!7. How many atoms are present in a 6.00 g sample of silver?
a. 1.07 x 10^-1 atoms
b. 6.47 x 10^2 atoms
c. 3.35 x 10^22 atoms
d. 3.61 x 10^24 atoms

8. How many atoms are present in 2.0 x 10^6 mol of carbon?
a. 3.3 x 10^-18 atoms
b. 4.0 x 10^-17 atoms
c. 1.0 x 10^29 atoms
d. 1.2 x 10^30 atoms

9. what mass is present in sample of AgNO3 containing 3.14 x 10^19 formula units?
a. 5.21 x 10^-5 g
b. 8.86 x 10^-3 g
c. 1.13 x 10^2 g
d. 1.92 x 10^4 g

10. How many molecules are present in 36.6 L of SO2 gas at STP?
a. 1.36 x 10^-21 molecules
b. 1.63 x 10^0 molecules
c. 1.54 x 10^22 molecules
d. 9.84 x 10^23 molecules

Answers

I got :
  7) C
  8) D
  9) B
10) D

The decimal difference in my calculations may be due to my rounding off or my use of the exact values in some cases.
Note: Mr - Molar Mass
L - Avogadro's Constant

Calculate the mass of HCl required to prepare 2.5 liters of a 0.08 molar solution of HCl. 1 H 1.01 Hydrogen 17 Cl 35.45 Chlorine