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ValentinkaMS [17]
2 years ago
4

The Periodic Table Unit Test

Chemistry
1 answer:
Leni [432]2 years ago
6 0

The answers include:

  • Metals can be hammered into thin sheets, and nonmetals are brittle is correct about metals and nonmetals.
  • Based on properties of elements in the periodic table,  vanadium is the element which is the best conductor of thermal energy.

  • Silicon is the element has four valence electrons.

  • Hydrogen does not have any neutrons is the statement which best explains why hydrogen’s atomic number is equal to its mass.

  • Francium has fewer valence electrons, but they are in a higher energy level is the statement which correctly compares the valence electrons for atoms of francium (Fr) and barium (Ba).

  • Gallium has an atomic number of 31 and a mass number of 70. The table which has *protons 31, neutrons 39, electrons 28 shows the number of protons, neutrons, and electrons in a gallium ion with a +3 charge.

  • A stable nucleus has a similar number of protons and neutrons is true about stable isotopes.

  • Atomic number is the atomic property proposed by Henry Moseley in which the current periodic table of the elements is based.

  • Electrons move freely in curved paths around the nucleus is the incorrect aspect of Rutherford’s model was fixed by Bohr’s model.

  • You plan to pass alpha particles through a field that contains a consistent type of particle. Low-energy alpha particles passing through a field of high mass-number-particles configuration will result in the largest deflection of alpha particles.

  • On the right side of the periodic table is where you will find elements that have full valence electron shells.

  • Nitrogen is the element which would have a full outer shell of electrons if it gained three electrons.

  • Fluorine, chlorine, and iodine are the group of elements which has the most similar chemical properties.

  • Group 2 elements have two valence electrons. An ionic bond is likely because they will want to give away two valence electrons in order to become stable.

  • An element has six valence electrons. 2– is the ionic charge which its ion will carry.
<h3>
What is a Metal?</h3>

This is a substance which allow heat or electric current to pass through it easily and examples include iron etc.

The answers to the questions can be seen above thereby making it the most appropriate choice.

Read more about Metal here brainly.com/question/25597694

#SPJ1

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When looking at a chemical reaction, the substance present before the reaction takes place are called the (5) and the substance
faltersainse [42]

Answer:

Explanation:

When looking at a chemical reaction, the substance present before the reaction takes place are called the (5)

REACTANT

and the substance produced after the reaction are the (6).

PRODUCT

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or the same.

REMEMBER: WHEN BALANCING EQUATIONS YOU CANNOT CHANGE THE SUBSCRIPTS OF THE COMPOUNDS, YOU CAN ONLY SHOW BY THE COEFFICIENTS HOW MANY MOLECULES YOU HAVE!

4 0
3 years ago
Negative radical in the periodic table​
yKpoI14uk [10]

Answer:

A radical is a group of atoms of elements carrying a charge, e.g., chlorate [ClO3–]. Radicals or ions are formed by losing or gaining electrons. When an electron is gained the group of atoms acquire a negative charge and is called a negative radical or negative ion.

5 0
3 years ago
4.60 mL of 0.1852 M HNO3 is titrated to the phenolphthalein indicator endpoint with 27.35 mL of a KOH solution. What is the mola
Kamila [148]

Answer:

M_{base}=0.0311M

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to solve for the molarity of the KOH solution by knowing this base react in a 1:1 mole ratio with nitric acid, HNO3; thus, we can write the following equation, as their moles are the same at the endpoint:

n_{acid}=n_{base}

Which in terms of molarities and volumes is:

M_{acid}V_{acid}=M_{base}V_{base}

Thus, we solve for the molarity of the base (KOH) to obtain:

M_{base}=\frac{M_{acid}V_{acid}}{V_{base}} \\\\M_{base}=\frac{4.60mL*0.1852M}{27.35mL}\\\\M_{base}=0.0311M

Regards!

4 0
3 years ago
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