Ions are formed by loss or gain of electrons.

Slides:

Advertisements

Similar presentations

Magnesium is Mg. Mn is manganese.

Advertisements

Ionization energy of Mg2+ >> Mg

At what temperature are the Celsius and Fahrenheit readings equal?

The term valence refers to the outermost shell.

QUESTION: A 25.0 gram sample of a compound is found to be 24% chlorine by mass. What is the percentage of chlorine in a 50.0 g sample of the compound?

Bohr assumed electrons move around the nucleus in circular orbits.

QUESTION: Which of the following elements is a post-transition metal? A. silicon, B. lead, C. sodium, D. chromium SCRIPT: Which of the following.

Na: 11 electrons, Na+: 10 electrons

How to tell from the formula if a compound is ionic:

A mole of atoms contains exactly 6.02x1023 atoms.

QUESTION: How many ways can the magnetism generated by the orbital motion of an electron in a 3p orbital be oriented? A. 1, B. 3, C. 5, D. 7 Magnetism.

Mass of proton : x kg, or u QUESTION: Which of the following has the largest total mass? A. 2 protons + 4 electrons B. 2 neutrons.

QUESTION: Which of the following elements is a transition metal? A. silicon, B. lead, C. sodium, D. chromium SCRIPT: Which of the following elements.

How to tell from the name if a compound is ionic:

SO3: one Sulfur atom: 16 protons

Uncertainty of g: tenths place

Choice B: Br2(l)  Br2(g)  2 Br(g)  2 Br+(g) + 2e-

C. molybdate, MoO42-, D. permanganate, MnO4-

Which of these is the formula of a reactant in this reaction?

QUESTION: Which of the following describes a cation? A. an aluminum ion (Al3+), B. an oxygen atom that has gained 2 electrons C. an ion with 17 protons.

Therefore the correct answer is D.

Which of the following has the largest size? A. K, B. K+, C. Se, D. Li

Uncertainty of 2500 mL: hundreds place [Larger]

QUESTION: Which of the following describes an anion? A. a sodium ion (Na+), B. a calcium ion that has lost 2 electrons C. an ion with 8 protons and 10.

QUESTION: Which of the following is a metalloid? A. Potassium, B. Silicon, C. Iron, D. Helium SCRIPT: Which of the following is a metalloid? A.

Mass of proton or neutron: 1.0 u Mass of electron: u

CLICK Here are some possible molecular formulas When x=1, we have NO2.

QUESTION: Which of the following elements is the best electrical conductor? A. carbon, B. germanium, C. manganese, D. iodine SCRIPT: A. carbon,

Ions are formed by loss or gain of electrons.

Ammonium sulfide is an ionic compound. Cation is ammonium ion. NH4+

To construct the ground state electron configuration,

Since both carbon and oxygen are nonmetals, choice C is wrong.

One Ca2+ ion: +2 One CO32- ion: -2

There are 3 orbitals in a p subshell (ml = -1, 0, or +1).

Ions are formed by loss or gain of electrons.

QUESTION: Which type of element has the lowest electronegativity? A. a metal, B. a nonmetal, C. a metalloid Electronegativity is a measure of the.

QUESTION: What is the electron configuration of Fe3+? A. [Ar] 4s2 3d6 B. [Ar] 4s2 3d3 C. [Ar] 4s1 3d4 D. [Ar] 3d5 SCRIPT: What is the electron configuration.

How many neutrons does an O-18 atom have? A. 8, B. 10, C. 16, D. 18

One Na+ ion: +1 One CO32- ion: -2

QUESTION: What is the electron configuration of naturally occurring aluminum ion? A. [Ne] 3s2 3p1, B. [Ne] 3s2 C. [Ne] 3s1, D. [Ne] The.

QUESTION: How should the result of the following calculation be reported, assuming that 1.8 and 32 are exact numbers? 32 + (1.8)(2.37) A. 36,

Cobalt(II) chloride is an ionic compound. Therefore:

What is the Kelvin temperature equivalent to 50.00oF?

Resonance structures must have same connectivity.

Uncertainty is at least +1/10 of smallest interval.

The simplest collection of ions with a total charge of zero would be….

Each calcium ion has a charge of +2,

Na2S is a binary, ionic compound. Binary: two elements (Na and S)

We can look up isotopic abundance for Mg and find:

B. Mg + O2  MgO + O C. Mg2 + O2  2 MgO D. 2 Mg + O2  2 MgO

Allowed values of principal quantum number (n): positive integers

Oxoanions have names ending in “ate” or “ite”

Therefore, the correct answer is A.

The area of a circle is found to be 2.4 cm2. What is the area in m2?

Iron(III) sulfate is an ionic compound. Cation is iron(III) ion. Fe3+

Iron(III) sulfide is an ionic compound. Therefore:

Ions are formed by loss or gain of electrons.

For which pair of molecules does dipole-dipole interaction occur?

give us something that is light blue, not yellow.

CLICK PAUSE END RECORDING

QUESTION: What is the maximum number of of electrons that can be assigned to a 2p orbital of an atom? A. 2, B. 3, C. 6, D. 10 Pauli’s Exclusion.

A. an element and two compounds, B. two elements and a compound,

X-78: mass=78.0 u, abundance = 30.0%

QUESTION: Which of the structures below is valid for the HOCl molecule? A. 1, B. 2, C. 3, D v.e. 12 v.e. 10 v.e. SCRIPT: Which of the structures.

0.800 m has three significant digits

What do molecules and polyatomic ions have in common?

Phosphate is PO43- Phosphite is PO33-

Mole is a group count (just like dozen).

K2CO3 is an ionic compound. Cation is potassium ion: K+

Which of the following is not a balanced chemical equation?

Presentation transcript:

Ions are formed by loss or gain of electrons. QUESTION: A magnesium atom becomes a magnesium ion (Mg2+) by… A. gaining two electrons, B. losing two electrons C. gaining two protons, D. losing two protons Ions are formed by loss or gain of electrons. A positively-charged ion is formed by losing electrons. A charge of +2 means a loss of two electrons. Standard way of indicating positive charges: +, 2+, 3+, etc. In older textbooks, you may see Mg++ or Mg+2 SCRIPT: A magnesium atom becomes a magnesium ion (Mg2+) by… A. gaining two electrons, B. losing two electrons C. gaining two protons, D. losing two protons PAUSE CLICK Ions are formed by loss or gain of electrons. So, immediately, we can rule out choices C and D. CROSS OUT C and D CLICK A positively-charged ion is formed by losing electrons. The number you see written on the upper right hand corner HIGHLIGHT 2+ Is the charge of the ion. Therefore, the ion given here ---- magnesium ion --- is a positive ion. It is formed when a magnesium atom loses two electrons. The correct answer is B. Note… the standard way of indicating positive charges is to write + if the charge is +1, HIGHLIGHT 2+ if the charge is +2 HIGHLIGHT 3+, if the charge is +3, And so on…. With older textbooks, however, you may see a +2 charge indicated with two pluses, HIGHLIGHT ++ in Mg++ Or with the plus sign in front of the number. HIGHLIGHT +2 in Mg+2 CLICK PAUSE END RECORDING

Video ID: 1-14-1 © 2008, Project VALUE (Video Assessment Library for Undergraduate Education), Department of Physical Sciences Nicholls State University Author: Glenn V. Lo Narrator: Funded by Louisiana Board of Regents Contract No. LA-DL-SELECT-13-07/08