diff --git a/1A_elements.txt b/1A_elements.txt
index 391de5e..2b2fa28 100644
--- a/1A_elements.txt
+++ b/1A_elements.txt
@@ -1 +1,5 @@
 H(1)
+Li(3)
+Na(11)
+K(19)
+Rb(37)
diff --git a/url.txt b/url.txt
new file mode 100644
index 0000000..665a601
--- /dev/null
+++ b/url.txt
@@ -0,0 +1 @@
+https://github.com/wang-xi-ya/HW.git