Chemistry exam 2

In the notation ²⁸⁹₁₁₅ Mc, the number 289 is the

• atomic mass

• atomic number

• number of neutrons

• number of electrons

What is the charge of an atom that has lost one electron?

• -1
• -2
• +1
• +2

Tags

NGSS.HS-PS1-1

What is the atomic mass of Copper?

• 63
• 29
• 34
• 92

Tags

NGSS.MS-PS1-1

How many neutrons are in a Gold atom?

• 79

• 196

• 117

• 275

Tags

NGSS.MS-PS1-1

Write the hyphen notation for the isotope that has 39 protons and 50 neutrons.

• Yttrium-11

• Tin-39

• Tin-89

• Yttrium-89

If X is the symbol for an element, which of the following two symbols represent isotopes of the same element?

• I and II

• III and IV

• I and IV

• I and III

How many protons, electrons, and neutrons does Chlorine -36 have?

• 17, 17, 19
• 17, 19, 19
• 17, 17, 36
• 17, 19, 36

Protons, neutrons, electrons

• 36, 36, 84
• 36, 46, 48
• 36, 48, 84
• 36, 36, 48

What is the relative formula mass of NaOH?

• 20
• 39
• 40
• 45

An element has two naturally occurring isotopes. One is 10.013 amu and is 19.9% abundant. The other is 11.01 amu and is 80.1% abundant. What is the average atomic mass? What element is it?

• 9.012 Beryllium

• 12.011 Carbon

• 6.941 Lithium

• 10.812 Boron