Chemistry - Unit 3 test

¡Supera tus tareas y exámenes ahora con Quizwiz!

What is the number of protons in phosphorus-31? (use element chart)

15

How many electrons are in an atom that has an atomic number of 34, an atomic mass of 74 and a charge of -2?

36

Which of the following is/are conclusions based on Rutherford's gold foil experiment? 1: Atom is mostly empty space 2: The nucleus is positively charged 3: The atom has a small dense nucleus 4: All answers are correct

4

How many neutrons in C-14?

8

Which scientist saw the atom as a solid sphere?

Dalton

Who was the Greek philosopher who called the smallest particle of matter as "atom"?

Democritus

Which of these particles was discovered first?

electrons

Two isotopes of carbon are carbon-12 and carbon-14. These isotopes differ from one another by two protons. (T or F)

false. would not be protons

Negative ions form when atoms _________ valence electrons.

gain

If the number of electrons in an atom changes you make a(n) __________________.

ion

Isotopes are atoms of the same element with different #'s of __________ & therefore different __________.

n^0 ; atomic masses

What is an anion's charge?

negative

What is the charge of an anion?

negative

What did James Chadwick discover?

neutron

Particles in an atom that are neutral and have no charge are

neutrons

What quantities vary between isotopes of an element?

neutrons and atomic mass

the central region of an atom where its neutrons and protons are is its

nucleus

What is a cation's charge?

positive

The positive particles of an atom are

protons

An atom is electrically neutral when

protons and electrons are the same

While making his model of an atom, what structure did Rutherford discover (containing protons and neutrons)?

the nucleus

The atomic mass of an element is the ___.

weighted average of the masses of the isotopes of the element

Which model involved gold foil?

Rutherford model

Where are electrons of an atom found?

electron cloud

If an element gains 2 electrons, what charge will it have when it becomes an ion?

-2

an atom with atomic number 6 would have how many protons

6

Which model is this?

Bohrs

Chlorine has two naturally occurring isotopes, Cl-35 and Cl-37, The atomic mass of chlorine is 35.45. Which of these two isotopes of chlorine is more abundant?

Cl-35

In the Thomson Model, he discovered the existence of what particle?

Electrons

According to the Bohr Model, electrons are only found in specific orbits around the nucleus called __________________________

Energy Levels

If X is the symbol for an element, which of the following two symbols represent isotopes of the same element? I. 77^35X II. 77^33X III. 81^37X IV. 81^35 X

I and IV

Which model of the atom proposed that atoms were positive spheres with negative electrons in them?

Plum Pudding Model

The atomic number of an elements is the total number of which particles in the nucleus?

Protons

Which statement best describes an electron?

Smaller mass than a proton and a negative charge

Which model is this?

Thomson model

What do these isotopes of carbon all have in common?

atomic number and electrons

In Dalton's Atomic Theory, all elements consist of __________ that cannot be divided.

atoms

Ions are:

atoms with a positive or negative charge

Which scientist developed the plum pudding/chocolate chip cookie model

thomson


Conjuntos de estudio relacionados

Hinduism and Buddhism Which is an example of karma? Jane accidentally trips someone in the hallway but does not apologize. Later, someone helps her up when she trips. Scott helps an elderly woman cross the street, and then he finds a $10 bill lying on th

View Set

Nutrition Consultant Exam Chp 1-3

View Set

WEEK 3: CHAPTER 12 - SOLVING A PROBLEM: CRIME AND JUSTICE

View Set

Peds Exam 1: Genitourinary & Respiratory

View Set

International Business Ch. 6: International Trade Theory

View Set

AGEC 330 Lecture 1, AGEC 330, Chapter 2 (pt 2) Time Value of Money Basics, AGEC 330 Exam 1, Ch. 9 Practice Problems, TAMU AGEC 330 with Leatham, AGEC 330 Lecture 15, AGEC 330, AGEC 330 Exam 4, AGEC 330 Lecture 24, AGEC 330 Exam 3 Review, AGEC 330 fin...

View Set